• Nervousness and irritability
• Palpitations  and tachycardia
• Heat intolerance or increased sweating
• Tremor
• Weight loss or gain
• Increase in appetite
• Frequent bowel movements or diarrhea
• Lower leg swelling
• Sudden paralysis
• Shortness of breath with exertion
• Decreased menstrual flow
• Impaired fertility
• Sleep disturbances (including insomnia)
• Changes in vision
  • Photophobia, or light sensitivity
  • Eye irritation with excess tears
  • Diplopia, or double vision
  • Exophthalmos, or forward protrusion of the eyeball
• Fatigue and muscle weakness
• Thyroid enlargement
• Pretibial myxedema (fluid buildup in the tissues about the shin bone; may be seen with Grave's disease)

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Hyperthyroidism is typically treatable and rarely fatal. However, complications can arise with:

• Untreated hyperthyroidism
• Side effects from therapies, including radioactive iodine, surgery and thyroid hormone replacement therapies

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