Symptoms of hyperthyroidism include:
Dramatic emotional swings
Increased heart rate
Frequent bowel movements
Unexplained weight loss, often despite an increased appetite
Feeling warm or hot all the time
Shortness of breath and heart palpitations
In women, menstrual periods may become less frequent or stop completely. Older people may develop heart failure or chest pain.
When Graves' disease causes hyperthyroidism, you also may have swelling of tissues behind the eyes. This causes a characteristic protruding, staring appearance.