Mood swings, hot flashes, sleeplessness -– everybody knows about the changes that happen to women as their levels of estrogen drop and they go throu...
In 1944, researchers Carl Heller and Gordon Myers identified symptoms of what they termed "male climacteric," another word for menopause; these included loss of libido, depression, inability to concentrate, and sometimes hot flashes.
The hormonal changes that are associated with menopause in women happen fairly quickly. In men, the decrease in testosterone is usually gradual, happening over decades.