Psychological Symptoms

• Nervousness, anxiety and hyperactivity can be caused by hyperthyroidism.
  
  

Cardiac Symptoms

• Patients may experience a fast heart rate (over 100 beats per minute), atrial arrhythmia and heart palpitations.
  
  

Digestive Symptoms

• Weight loss despite increased appetite is a common symptom of hyperactive thyroid. Diarrhea may also occur.
  
  

Dermatological Symptoms

• Increased perspiration along with warm, moist skin can be signs of a hyperactive thyroid.
  
  

Other Bodily Symptoms

• Muscle weakness, tremors and heat intolerance are also possible hyperthyroidism symptoms. Since the body is thrown into overdrive by a hyperactive thyroid, patients may begin to experience fatigue if the condition goes untreated.