Why would a doctor suspect that someone has a low level of testosterone?
Symptoms related to low testosterone include: decreased sex drive, erectile dysfunction (ED), lowered sperm count, increased breast size (a condition called gynecomastia), hot flashes, increased irritability, trouble concentrating, and depression. Men who have a severe and prolonged reduction of testosterone also may experience loss of body hair, reduced muscle mass and bone fractures due to osteoporosis. Certain medical conditions also can cause the condition.