Hypothyroidism.

Overview

Hypothyroidism occurs when the thyroid gland makes too little thyroid hormone, which can affect energy, temperature regulation and many body processes.

A condition may appear differently between people, so a symptom list alone cannot establish a diagnosis. Age, medical history and other circumstances affect assessment.

Signs and symptoms

Common symptoms can include fatigue, feeling cold, constipation, dry skin, slowed thinking and weight changes. Symptoms develop gradually and overlap with many other conditions. A blood test is needed rather than relying on appearance or a symptom checklist alone.

Causes and risk factors

Autoimmune thyroid disease, prior thyroid surgery, radiation or certain medicines can be causes.

Risk factors do not guarantee that a person will develop this condition, and a diagnosis can occur even without obvious risk factors.

Diagnosis and tests

Blood tests such as TSH and free thyroid hormone help establish diagnosis and guide treatment.

Tests are chosen for the individual situation. No picture or AI-generated response can confirm this condition.

Care and treatment

Levothyroxine replacement is commonly used, with individualized adjustments and monitoring.

Treatment plans must consider severity, other illnesses, medication safety and personal preferences. Do not start or change prescribed treatment using this article alone.

Prevention and daily living

Consistent thyroid-hormone replacement when prescribed and scheduled blood monitoring are important. Ask about interactions with iron, calcium or medicines that affect absorption and about follow-up when pregnant.

Individual care plans may differ, particularly in pregnancy, childhood, older age or when other illnesses are present. The linked clinical source provides more context.

When to seek help

Severe lethargy, hypothermia or confusion in a profoundly unwell person needs emergency assessment.

If symptoms are severe, rapidly worsening or you feel unsafe, seek local emergency services. Do not wait for an online reply.

Questions for a clinician

What evidence supports this diagnosis? What tests are necessary? Which treatment options fit my situation? What should I monitor? When should I return or seek urgent help?