Hypothyroidism

Audience: Patients and providers
Status: Clinical guide · patient + provider
Last updated: 2026-03-09

1. Clinical overview

Hypothyroidism is inadequate thyroid hormone production, most often from autoimmune thyroiditis, and management depends on accurate diagnosis, safe levothyroxine dosing, and follow-up TSH interpretation.

2. Common causes and risk factors

Insufficient thyroid hormone production, commonly autoimmune thyroiditis.
Other causes: post-thyroidectomy/ablation, medications, central hypothyroidism.

3. Typical symptoms

Fatigue, cold intolerance, constipation, weight gain, dry skin, depression/cognitive slowing.

4. Diagnosis and evaluation

Confirm diagnosis with guideline-based history, exam, and indicated testing.
Screen for severity, complications, and high-risk comorbid conditions.
Identify social or access barriers that could affect treatment success.

5. Treatment (non-pharmacologic)

Medication timing education (empty stomach, separation from interacting supplements).
Cardiometabolic risk reduction and symptom tracking.

6. Treatment (pharmacologic)

Levothyroxine is standard replacement therapy and is the main medication most patients need.
Dose is individualized by TSH target, body size, age, cardiovascular risk, pregnancy status, and whether disease is overt or subclinical.
Liothyronine or combination T4/T3 strategies are not routine first-line therapy and usually require more selective use.

7. Monitoring and follow-up

TSH (and free T4 when indicated) after dose changes and periodically once stable.

8. Practical counseling points

Give patients a clear “what to do today / when to call / when to seek urgent care” plan.
Use teach-back to confirm understanding of treatment goals and medication instructions.
Simplify regimens when possible to improve adherence and outcomes.

9. Red flags and escalation

Escalate care urgently for severe or rapidly worsening symptoms.
Reassess diagnosis if expected response does not occur within the anticipated timeline.

10. Guideline references

Note: Educational guide only; not a substitute for individualized medical care.