General Medicine for NEET-PG
Thyroid Disorders for NEET-PG
Thyroid disorders cover hyperthyroidism, hypothyroidism, thyroiditis, and thyroid nodules, and their interpretation of function tests is a reliably tested NEET-PG topic. The subject integrates endocrinology, pathology, and pharmacology, so it draws varied question types. Because diagnosis hinges on the pattern of thyroid-stimulating hormone with free thyroxine, correct interpretation of function tests is the essential deliverable. Examiners favour the causes and treatment of Graves disease, the features and management of hypothyroidism including in pregnancy, the different types of thyroiditis, and the evaluation of a solitary nodule. Thyroid storm and myxoedema coma as endocrine emergencies recur. The topic links to obstetrics, pharmacology of antithyroid drugs, and thyroid cancer pathology. Common traps include misreading the function test pattern, confusing the painful and painless thyroiditis subtypes, forgetting that propylthiouracil is preferred in the first trimester of pregnancy, and overlooking the radioactive iodine uptake pattern that distinguishes Graves disease from thyroiditis.
MedNext Academy | 3 min read
Thyroid Disorders for NEET-PG
Thyroid disorders cover hyperthyroidism, hypothyroidism, thyroiditis, and thyroid nodules, and their interpretation of function tests is a reliably tested NEET-PG topic. The subject integrates endocrinology, pathology, and pharmacology, so it draws varied question types. Because diagnosis hinges on the pattern of thyroid-stimulating hormone with free thyroxine, correct interpretation of function tests is the essential deliverable. Examiners favour the causes and treatment of Graves disease, the features and management of hypothyroidism including in pregnancy, the different types of thyroiditis, and the evaluation of a solitary nodule. Thyroid storm and myxoedema coma as endocrine emergencies recur. The topic links to obstetrics, pharmacology of antithyroid drugs, and thyroid cancer pathology. Common traps include misreading the function test pattern, confusing the painful and painless thyroiditis subtypes, forgetting that propylthiouracil is preferred in the first trimester of pregnancy, and overlooking the radioactive iodine uptake pattern that distinguishes Graves disease from thyroiditis.
Thyroid disorders cover hyperthyroidism, hypothyroidism, thyroiditis, and thyroid nodules, and their interpretation of function tests is a reliably tested NEET-PG topic. The subject integrates endocrinology, pathology, and pharmacology, so it draws varied question types. Because diagnosis hinges on the pattern of thyroid-stimulating hormone with free thyroxine, correct interpretation of function tests is the essential deliverable. Examiners favour the causes and treatment of Graves disease, the features and management of hypothyroidism including in pregnancy, the different types of thyroiditis, and the evaluation of a solitary nodule. Thyroid storm and myxoedema coma as endocrine emergencies recur. The topic links to obstetrics, pharmacology of antithyroid drugs, and thyroid cancer pathology. Common traps include misreading the function test pattern, confusing the painful and painless thyroiditis subtypes, forgetting that propylthiouracil is preferred in the first trimester of pregnancy, and overlooking the radioactive iodine uptake pattern that distinguishes Graves disease from thyroiditis.
Key points
- **Function test interpretation:** Low TSH with high free T4 indicates primary hyperthyroidism; high TSH with low free T4 indicates primary hypothyroidism.
- **Graves disease:** Autoimmune hyperthyroidism with TSH receptor antibodies, diffuse goitre, ophthalmopathy, and raised radioiodine uptake.
- **Antithyroid drugs:** Carbimazole and methimazole are first-line; propylthiouracil is preferred in the first trimester and can cause hepatotoxicity.
- **Hypothyroidism:** Commonly from Hashimoto thyroiditis or iodine deficiency; treated with levothyroxine titrated to normalise TSH.
- **Hashimoto thyroiditis:** Autoimmune destruction with anti-thyroid peroxidase antibodies; a leading cause of hypothyroidism and associated with lymphoma risk.
- **Subacute thyroiditis:** A painful, tender gland often after a viral illness, with low radioiodine uptake and a self-limiting course.
- **Thyroid nodule evaluation:** Ultrasound and fine-needle aspiration cytology assess malignancy risk; a cold nodule on scan is more concerning.
- **Papillary carcinoma:** The commonest thyroid cancer, with lymphatic spread, psammoma bodies, and a generally good prognosis.
- **Medullary carcinoma:** Arises from parafollicular C cells, secretes calcitonin, and may be part of multiple endocrine neoplasia type 2.
- **Pregnancy:** Levothyroxine dose usually needs to rise in pregnancy; untreated hypothyroidism harms foetal neurodevelopment.
- **Thyroid emergencies:** Thyroid storm needs beta-blockers, antithyroid drugs, and supportive care; myxoedema coma needs thyroid hormone and steroids.
Frequently Asked Questions
How do I interpret thyroid function tests?
Read TSH with free T4 together. Low TSH with high free T4 is hyperthyroidism, high TSH with low free T4 is hypothyroidism, and high TSH with normal free T4 is subclinical hypothyroidism.
Why is propylthiouracil preferred in early pregnancy?
Methimazole and carbimazole carry a higher risk of congenital malformations in the first trimester, so propylthiouracil is favoured then despite its hepatotoxicity risk.
How does Graves disease differ from thyroiditis on a scan?
Graves disease shows raised diffuse radioiodine uptake, while thyroiditis shows low uptake because hormone is leaking from a damaged gland rather than being newly synthesised.
How is a solitary thyroid nodule assessed?
With ultrasound to characterise features and fine-needle aspiration cytology to assess malignancy. Function tests help, and a cold nodule on isotope scan carries higher concern.
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