What Are the Symptoms of Thyroid Problems?

Thyroid symptoms depend on whether the thyroid is underactive (hypothyroidism) or overactive (hyperthyroidism).

Hypothyroidism Symptoms (Underactive)

• Fatigue and sluggishness
• Weight gain
• Cold intolerance
• Dry skin and hair loss
• Constipation
• Depression and brain fog
• Slow heart rate
• Heavy periods
• Hoarse voice

Hyperthyroidism Symptoms (Overactive)

• Anxiety and nervousness
• Weight loss despite increased appetite
• Rapid or irregular heartbeat
• Heat intolerance and sweating
• Tremor
• Insomnia
• Frequent bowel movements
• Muscle weakness
• Bulging eyes (Graves' disease)

When to Get Tested

• Multiple symptoms from either list
• Family history of thyroid disease
• Autoimmune conditions
• Pregnancy planning