Question: what are the side effects of synthetic thyroid hormone?
Answer: General. fatigue, increased appetite, weight loss, heat intolerance, fever, excessive sweating;
Central Nervous System. headache, hyperactivity, nervousness, anxiety, irritability, emotional lability, insomnia;
Musculoskeletal. ... 
Cardiovascular. ... 
Respiratory. ... 
Gastrointestinal. ... 
Dermatologic. ... 
Endocrine.