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| Causes | |
|---|---|
| Physiological factors | Puberty or aging |
| Endocrine tumors | Testicular, adrenocortical or pituitary tumors, or ectopic hCG-secretion |
| Endocrine dysfunctions | Hypogonadism, hyperthyroidism, obesity or refeeding |
| Non-endocrine diseases | Cirrhosis, renal failure or HIV |
| Drug-induced factors | Medications, anabolic steroids or illicit drugs |
| Idiopathic factors | |
