Symptoms of androgen or testosterone decline in men, sometimes colloquially referred to as male menopause, include depression, weakness and fatigue, according to WebMD. Loss of interest in sex, decreased libido, subtle changes in the function of the testes, or other sexual problems may also occur.
Doctors diagnose androgen decline by a physical exam and tests to rule out other problems that may cause similar symptoms, notes WebMD. Doctors often recommend testosterone replacement therapy for men experiencing androgen decline. Lifestyle changes also help, including dietary changes and getting sufficient exercise. Doctors also prescribe antidepressants to men battling the depression associated with the condition.