What are signs you may have a thyroid problem?

Common signs of a thyroid problem depend on whether the gland is overactive or underactive. An underactive thyroid (hypothyroidism) can cause fatigue, weight gain, feeling cold, dry skin, hair loss, constipation, depression, and slow heart rate. An overactive thyroid (hyperthyroidism) tends to cause weight loss, rapid or irregular heartbeat, anxiety, sweating, heat sensitivity, tremors, and difficulty sleeping. Other general warning signs include a visible swelling or lump in the neck, changes in voice, difficulty swallowing, and persistent muscle weakness. Women may also notice irregular menstrual cycles. Since many of these symptoms overlap with other conditions, a doctor can confirm a thyroid issue through a simple blood test measuring thyroid hormone levels.