/WHAT_IT_IS
TSH is the pituitary signal that drives thyroid hormone production. It's the most sensitive screen for thyroid dysfunction and worth checking annually on TRT.
/NORMAL_RANGE
Reference: 0.4–4.0 mIU/L. Optimal: 1.0–2.0 for most adults.
What does high TSH mean?
- +Hypothyroidism (Hashimoto's, iodine deficiency, postpartum thyroiditis).
- +Some medications (lithium, amiodarone).
What does low TSH mean?
- +Hyperthyroidism (Graves', toxic nodule).
- +Excess thyroid hormone supplementation.
/ON_TRT
Untreated hypothyroidism mimics low T (fatigue, low libido, weight gain) and raises SHBG, suppressing free T. Hypothyroidism is the most commonly missed reason men on TRT don't feel right despite "perfect" labs. If TSH is >2.5 with symptoms, check free T3 and free T4 and antibodies.
/RELATED
FAQ
/01Can TRT cause thyroid problems?+
TRT doesn't directly cause thyroid disease, but autoimmune thyroid conditions cluster with other endocrine issues. Worth annual screening even if asymptomatic.
Track TSH in the app.
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