Clinical Guides
Depression
An India-adapted clinical guide to recognising depressive illness, excluding bipolar, substance and medical mimics, assessing suicide risk, and planning treatment, follow-up and relapse prevention.
MedNext Academy | 13 min read
Depression
An India-adapted clinical guide to recognising depressive illness, excluding bipolar, substance and medical mimics, assessing suicide risk, and planning treatment, follow-up and relapse prevention.
Summary
Depression is a clinical syndrome in which persistent low mood, loss of interest or pleasure, or both occur with cognitive, behavioural and bodily symptoms that cause meaningful distress or impaired function. Sleep and appetite can increase or decrease; energy, concentration, confidence, movement, sexual interest and hope may change. Some people primarily report pain, fatigue, gastrointestinal symptoms, poor academic performance or irritability rather than sadness. Bereavement, debt, discrimination or illness may be important precipitants, but a recognisable stressor neither proves nor excludes depressive illness.
Diagnosis requires a confidential, person-centred assessment, not a questionnaire score. Establish symptom pattern, duration, severity, functional effect, previous episodes and treatments, physical illness, medicines, alcohol and other substances. Always ask directly about thoughts of death, self-harm, suicide intent, plans, access to means and recent acts. Before prescribing an antidepressant, actively seek past periods of elevated or unusually irritable mood, reduced need for sleep, increased activity, impulsive behaviour or psychosis because bipolar depression needs a different pathway.
Treatment is matched to severity, risk, preference, prior response, comorbidity and access. Options include structured psychological therapies, behavioural activation, guided self-help, exercise delivered as an intervention, antidepressant medication and combinations of treatment. More severe, psychotic, catatonic, perinatal, refractory or high-risk illness generally needs specialist input. Electroconvulsive therapy is reserved for defined severe circumstances with consent and governance. Recovery means more than a lower score: restore sleep, relationships, self-care, learning and work, then plan relapse prevention. This reviewed educational guide is assigned to the MedNext Clinical Team.
How Common Is It?
Depression is common across countries and age groups, but no single prevalence figure should be transplanted into every Indian setting. Estimates depend on diagnostic criteria, time period, sampling, language, interview method and whether impairment is required. Community surveys, primary-care screens and psychiatric-clinic records describe different populations. Symptoms are often under-recognised where distress is expressed physically, mental-health language is stigmatised or travel and cost delay help-seeking. Conversely, a positive brief screen estimates probability; it is not the same as a clinician-confirmed disorder.
The burden is visible in ordinary function. Depression can impair eating, sleep, concentration, parenting, medication adherence, examination performance, employment and relationships. It commonly coexists with anxiety, substance use, chronic pain, diabetes, cardiovascular disease, cancer, neurological illness and disability. These associations run in both directions and should prompt integrated care, not the assumption that every symptom is psychological. Recurrent episodes and residual symptoms increase relapse risk, while social isolation, debt, violence and insecure housing can sustain distress even when a biological treatment is useful.
India's National Mental Health Survey and later programme documents show a treatment gap for mental disorders, but service access varies greatly between states and districts. A clinician should identify the real local route rather than promise psychotherapy, a district team or a medicine that is unavailable. Public-health significance does not make individual outcomes inevitable. Many patients improve with evidence-based care; prompt suicide assessment, continuity, practical support and an adequate trial of the chosen treatment are more useful than population statistics during a consultation.
Risk Factors
Depression usually reflects interacting vulnerability and adversity rather than one cause. Prior depression is among the strongest clues to recurrence. Family history, childhood adversity, bereavement, interpersonal loss, loneliness, unemployment, financial strain, caregiving, chronic pain, disability, sleep disruption, postpartum change, menopause, discrimination and exposure to violence may increase risk. These factors are neither necessary nor sufficient and must never be framed as weakness or personal failure. Protective relationships and meaning can help without making a person immune.
Medical illness can precipitate, mimic or complicate depression. Hypothyroidism, anaemia, sleep apnoea, neurological disease, infection, nutritional deficiency and endocrine disorders deserve clinically directed consideration. Corticosteroids, interferon and some other medicines can alter mood; alcohol, opioids, sedatives, stimulants and withdrawal can produce or deepen symptoms. The temporal relationship matters. A complete medication and substance history includes prescribed, over-the-counter, traditional and non-medical products, frequency, quantity, recent change and consequences.
Risk of self-harm is dynamic. Previous attempt, current intent, a specific plan, access to lethal means, agitation, hopelessness, intoxication, psychosis, severe insomnia, recent discharge, major loss and social isolation raise concern. Sudden apparent calm after intense suicidal distress can be misleading. Ask about dependants, domestic abuse, coercion and safeguarding privately. Bipolarity is a treatment-risk factor: antidepressant monotherapy may worsen activation or cycling in some patients with bipolar disorder. Pregnancy, adolescence and older age change medicine, capacity and monitoring decisions. Risk formulation should state foreseeable scenarios, protective factors and actions rather than labelling a person simply low, medium or high risk.
Diagnosis
History
Ask about mood, interest, energy, sleep, appetite, weight, concentration, guilt, worthlessness, psychomotor change, irritability and thoughts of death, together with onset, persistence and effect on self-care, family, study and work. Clarify prior episodes, seasonal or postpartum pattern, psychosis and treatment response. Screen for mania or hypomania, anxiety, trauma, obsessive symptoms, eating disorder, alcohol and other substances. Ask directly and non-judgementally about self-harm, suicidal intent, plan, preparation, means and recent attempts. Obtain collateral history with consent, unless urgent safety or legal duties justify limited disclosure.
Examination
Complete a mental-state examination: appearance, rapport, speech, psychomotor state, mood, affect, thought form and content, perception, cognition, insight and decision-specific capacity. Observe self-neglect, intoxication, withdrawal, catatonia or agitation. Perform a symptom-led physical and neurological examination, including vital signs, hydration, nutritional state and injuries. Pregnancy testing or safeguarding examination requires consent and an appropriate setting.
Investigations
There is no laboratory or imaging test that diagnoses primary depression. Use PHQ-9 or another validated tool to support recognition and monitor change, not to replace interview, impairment or risk assessment. Order tests to investigate a plausible alternative or baseline treatment issue: examples include full blood count, thyroid function, metabolic profile, pregnancy, toxicology, ECG or cognition assessment depending on presentation and proposed care. Review diagnosis if symptoms are atypical, treatment causes activation, psychosis emerges or response is absent. Determine clinical severity from symptoms, function, duration, risk and context; do not equate one numerical threshold with the whole person.
Differential Diagnosis
Bipolar depression is the critical psychiatric alternative before antidepressant treatment. Ask about any lifetime episode of reduced need for sleep, increased energy or activity, pressured speech, grandiosity, excessive spending, risky sexual behaviour, unusually productive periods and hospitalisation. Irritability alone does not diagnose bipolar disorder, but antidepressant-related activation or recurrent abrupt episodes warrants specialist assessment. Psychotic depression includes delusions or hallucinations occurring with a severe depressive episode; primary psychotic disorders require a longitudinal account of psychosis outside mood episodes.
Grief can involve intense sadness and yearning without constituting a disorder, yet bereavement does not protect against depression or suicide. Adjustment disorder is closely linked to a stressor and may not meet a depressive syndrome. Anxiety disorders, PTSD, OCD, eating disorders, personality difficulties, ADHD, autism and dementia can coexist or alter expression. Substance intoxication or withdrawal, especially involving alcohol, sedatives, stimulants or opioids, may create depressive symptoms and acute risk. Do not diagnose a personality disorder during a single crisis merely because self-harm is recurrent.
Medical differentials include hypothyroidism, anaemia, sleep apnoea, chronic infection, epilepsy, Parkinson disease, stroke, dementia, malignancy, autoimmune disease, endocrine disturbance and medication effects. Delirium causes an acute fluctuating disturbance of attention and requires urgent medical assessment. In postpartum illness, distinguish depression from transient blues, postpartum psychosis and bipolar disorder; psychosis, confusion or rapidly changing mood is an emergency. Severe fatigue and pain should not be dismissed when physical findings or trajectory suggest another disease. The safest formulation can include depression plus a physical condition, substance disorder or social crisis rather than forcing one explanation.
Management
Begin with shared formulation, immediate safety actions and practical goals meaningful to the patient. Explain treatment options, uncertainty, expected time course, possible harms, access and the right to decline. For less severe depression, current guidelines includes guided self-help, structured behavioural activation, group or individual exercise interventions and psychological therapies; routine antidepressant medication is not automatically first choice unless informed preference or clinical context supports it. For more severe depression, options include individual CBT with an antidepressant, individual CBT, behavioural activation, antidepressant treatment and other evidence-based psychological therapies. Availability must not be confused with effectiveness.
Psychotherapy should be delivered by a trained, supervised practitioner using an evidence-based model. CBT addresses unhelpful thinking and behaviour; behavioural activation systematically reconnects activity with goals and reinforcement; interpersonal therapy targets role transitions, loss and relationships. Generic encouragement or unstructured counselling is not equivalent. Address sleep, alcohol, nutrition, pain, debt, violence, housing and isolation alongside specific treatment. Involve family only with consent and only when safe.
Review treatment response, function, adherence, adverse effects and suicide risk after starting, commonly within two to four weeks and sooner when risk or age requires. If response is limited, first revisit diagnosis, bipolarity, substances, comorbidity, adherence, dose adequacy, duration and therapy quality. Then share decisions about switching, combining or specialist augmentation. Psychotic depression, catatonia, recurrent severe illness or complex refractory disease needs specialist coordination. Continue effective treatment long enough to consolidate recovery, and create a relapse plan naming residual symptoms, triggers, early warning signs, support contacts and the action to take if risk returns.
Prescribing Information
Antidepressants should follow a full assessment and shared decision by an appropriately qualified prescriber. Discuss the purpose, realistic benefits, delayed onset, common adverse effects, sexual effects, sleep and weight effects, interactions, early activation, possible suicidal thoughts, withdrawal symptoms and how follow-up will occur. Choice depends on prior response, comorbidity, overdose toxicity, pregnancy or breastfeeding, age, hepatic and renal function, concurrent medicines, availability and cost. This page deliberately provides no personal drug, dose or titration schedule.
Before prescribing, look for bipolar disorder, psychosis, substance use and current suicide risk. Limit quantities and consider toxicity in overdose when risk is significant without withholding treatment solely because suicidal thoughts exist. Monitor young adults and others at heightened risk especially closely after initiation or dose change. Older adults may be more vulnerable to falls, hyponatraemia, bleeding and interactions. Serotonergic combinations, monoamine oxidase inhibitor switches and augmentation with lithium or antipsychotics require expert knowledge of washout, toxicity and monitoring. Herbal products can interact and should be disclosed.
Do not stop an antidepressant abruptly unless an emergency specifically requires it. Withdrawal can include dizziness, sensory symptoms, anxiety, sleep disturbance, nausea and mood change; tapering should be individualised and slowed when symptoms are difficult. Distinguish withdrawal from relapse using timing and symptom character. In pregnancy or breastfeeding, balance untreated illness against fetal, neonatal and maternal medicine risks with perinatal expertise; sudden cessation can also harm. If mania, severe agitation, akathisia, serotonin toxicity, marked hyponatraemia, severe rash or emergent suicidal intent occurs, reassess urgently. Document the monitoring and discontinuation plan from the start.
When to Refer
Refer urgently to emergency or specialist mental-health care when there is imminent suicide risk, a recent serious attempt, inability to maintain safety, severe self-neglect, psychosis, mania, catatonia, violent risk, delirium, severe intoxication or withdrawal. A medically unstable overdose goes first through emergency medical and toxicology care. Do not leave a high-risk person alone, advise them merely to think positively, or rely on a no-suicide promise. Arrange supervised transfer, restrict access to means where lawful and feasible, and communicate directly with the receiving service.
Specialist referral is appropriate for diagnostic uncertainty, suspected bipolar disorder, psychotic or recurrent severe depression, significant pregnancy or postpartum complexity, prominent substance dependence, treatment resistance, severe comorbidity, cognitive impairment, need for augmentation or consideration of ECT. Refer children and adolescents to age-appropriate services; adult guidelines and dosing must not be extrapolated. Older adults with frailty, polypharmacy or cognitive change may need coordinated geriatric and psychiatric assessment. Safeguarding or domestic-violence pathways are required when depression occurs with abuse or risk to dependants.
In India, routes may include a Health and Wellness Centre, primary health centre, District Mental Health Programme service, medical-college psychiatry department, private psychiatrist or emergency department. Verify the service, hours, cost and transport. A referral letter should include symptoms, function, direct risk assessment, medical and substance history, bipolar screen, current medicines, prior treatments and response, pregnancy status, social supports, language needs and patient preference. Maintain follow-up until care is actually transferred; issuing a referral is not continuity.
Red Flags
Immediate red flags include current suicidal intent, a feasible plan, preparatory acts, access to lethal means, a recent attempt, escalating self-harm, command hallucinations, severe agitation, intoxication, violent threats, inability to eat or drink, profound neglect and inability to care safely for a child or dependent adult. Ask direct questions; doing so does not implant suicidal ideas. Record the patient's words, intent, means, timeframe, previous acts, protective factors, capacity, people contacted and concrete disposition. Risk can change quickly and must be reassessed after loss, discharge, intoxication, treatment change or worsening insomnia.
Mania or mixed features are treatment red flags: markedly reduced need for sleep, increased energy, pressured speech, racing thoughts, grandiosity, disinhibition or rapidly shifting agitation needs urgent diagnostic review. Psychotic depression may involve nihilistic, guilty or persecutory delusions and can impair eating, drinking or treatment decisions. Catatonia may present with stupor, mutism, posturing or severe psychomotor change. Postpartum confusion, bizarre beliefs, rapid mood change or thoughts of harming self or infant is an emergency.
Physical red flags must not be relabelled as depression. Fever with confusion, focal neurological deficit, seizure, severe headache, hypoxia, hypoglycaemia, significant weight loss, endocrine crisis and toxic ingestion require medical evaluation. After treatment begins, new intense restlessness, severe agitation, suicidal worsening, mania, serotonin toxicity, severe hyponatraemia symptoms or allergic reaction needs prompt care. A sudden energy increase before hopelessness improves can increase capacity to act on suicidal thoughts. Every patient should leave with a specific crisis plan, not a generic instruction to return if worse.
Indian Clinical Context
India's MoHFW operational guidance for mental, neurological and substance-use care supports identification, psychosocial intervention, referral, adherence support and follow-up across community and primary-care platforms. It includes PHQ-9 as a sample tool but does not turn screening into diagnosis or guarantee trained psychotherapy in every centre. Medicines are linked to state essential-drug lists and prescribing by trained clinicians. Confirm current district capacity rather than promising a service or recommending an unavailable formulation. Tele-MANAS or other national and state access routes may help, but emergency risk still requires a locally verified crisis pathway.
The Mental Healthcare Act, 2017 establishes rights relevant to access, dignity, confidentiality, nominated representatives, advance directives, decision-specific capacity and emergency treatment. Section 115 creates a presumption of severe stress after attempted suicide and a duty of care, treatment and rehabilitation; it does not remove the need for individual medical and suicide assessment. Family involvement can support adherence and safety, yet consent, privacy and the possibility of coercion or violence must be considered. Language, caste, gender, sexuality, migration, debt and examination pressure can shape distress and access without being treated as character flaws.
current guidelines provides a detailed external evidence comparator but is not an Indian legal, licensing or formulary document. Local clinicians must use current Indian medicine information, institutional policy and professional scope. This guide neither claims that MedNext can deliver treatment nor directs a patient to rely on an educational platform in crisis. It has been reviewed by the MedNext Clinical Team and reviewed. Public-facing publication requires the MedNext Clinical Team's documented approval, source recheck and date-stamped governance.
NMC Competency Mapping
Depression supports NMC CBME learning across psychiatry, medicine, pharmacology, community medicine, obstetrics, paediatrics, geriatrics, emergency care and AETCOM. At Know level, learners should describe core depressive symptoms, functional impairment, severity, psychotic features, recurrence and major treatment classes. They should recognise that PHQ-9 is an assessment aid, not a stand-alone diagnosis, and that grief, adversity and medical illness require contextual interpretation.
At Know How level, learners should distinguish unipolar depression from bipolar disorder, delirium, dementia, substance effects and hypothyroidism. They should explain why suicide enquiry is direct and structured, why antidepressants have delayed benefit and withdrawal phenomena, and why psychotherapy quality matters. At Show How level, simulated encounters should test a confidential mood and mania history, mental-state examination, direct suicide assessment, safeguarding enquiry, shared treatment explanation and structured emergency handover. Marks should reward empathy plus safe action, not euphemism.
At Perform level, patient care remains supervised and within scope. Learners can participate in measurement-based follow-up, review adherence and adverse effects, document capacity and communicate a crisis plan, but must not independently initiate, combine or stop psychotropic medicines after reading this guide. Professional learning includes confidentiality, consent, non-stigmatising language, safe family involvement, accurate certification and respect for rights under Indian law. This mapping does not invent a disease-specific competency code or imply that page completion demonstrates competence; workplace observation and faculty assessment remain necessary.
Key Exam Pearls for NEET PG
Depression is diagnosed clinically from persistent mood or loss-of-interest symptoms, associated changes and impairment; PHQ-9 helps recognition and monitoring but is not sufficient alone. Severity depends on symptom burden, function, duration, psychosis and risk, not a score in isolation. Always ask about suicide and always screen for lifetime mania or hypomania before calling an episode unipolar. Reduced need for sleep with increased energy differs from insomnia with fatigue. Psychotic depression and postpartum psychosis require urgent specialist care.
Common mimics include hypothyroidism, anaemia, sleep disorders, neurological disease, medicine effects, alcohol or sedative withdrawal and stimulant use. Delirium is acute and fluctuating with impaired attention; dementia has a different longitudinal cognitive course, although either can coexist with depression. Bereavement is not automatically a disorder, but severe depressive illness and suicide can occur after loss.
Less severe depression may be treated with structured psychological or psychosocial options according to preference; antidepressants are not automatically the default. More severe depression may need psychological therapy, medication or their combination. Monitor early activation, suicidal worsening, adverse effects and adherence, then reassess within weeks. Do not stop antidepressants abruptly; withdrawal may mimic relapse. Failure to respond first prompts review of diagnosis, bipolarity, substances, adherence, adequacy and comorbidity. ECT is considered for severe depression when rapid response is needed or other treatments have failed, with consent, anaesthetic assessment and specialist governance. Relapse prevention includes continuation of effective care and an explicit early-warning plan.
Frequently Asked Questions
Can someone have depression even if they do not describe feeling sad?
Yes. Loss of interest, fatigue, irritability, poor concentration, sleep or appetite change, pain and declining function may dominate. A clinician still needs to assess the full syndrome, impairment, physical causes, substances, bipolar features and suicide risk rather than diagnose from one symptom.
Why is a history of unusually high energy important before antidepressant treatment?
Periods of reduced need for sleep, increased activity, pressured speech, grandiosity or risky behaviour can indicate bipolar disorder. Bipolar depression has different treatment risks, and antidepressant monotherapy may provoke activation in some patients. Suspected bipolarity needs a specialist diagnostic pathway.
Should antidepressants be stopped as soon as a person feels better?
Usually not without a planned clinical review. Improvement needs consolidation, and abrupt cessation can cause withdrawal symptoms or increase relapse risk. Duration and tapering depend on episode history, residual symptoms, adverse effects, patient preference and the particular medicine, with agreed follow-up.
When is electroconvulsive therapy considered for depression?
ECT may be considered by specialist teams for severe depression when a rapid response is needed, when other treatments have been unsuccessful, or when prior ECT response influences the decision. It requires informed consent or the applicable legal framework, anaesthetic assessment, monitoring and discussion of memory effects.
Inside MedNext for this topic
- 411 MedNext-authored chapters
- 80,000+ MCQ bank
- 15 study modes
- a growing library of visual revision sheets
Study modes
- Notes
- MCQ
- Audio
- Video
- Visual
- 3D Anatomy
- Trace
- Flashcards
- Mnemonics
- Image Bank
- Clinical
- Microscopy
- Audio QBank
- Cadaver
- Book Match
Continue reading
Clinical GuidesAll Clinical Guides
Browse all clinical management guides for Indian medical practice.
Test your knowledge
Attempt structured MCQs on this topic to consolidate your understanding and connect the guide to exam-focused practice.
Try MCQs on this topic