Causes of low testosterone?

Pituitary or testes?: In general, persistent low testosterone (not transient from acute sickness) is due to dysfunction in pituitary ("master gland"), or testes glands. Checking pituitary hormones (prolactin, lh, fsh) can distinguish between the two categories, and can determine whether brain scanning is needed. Illness and narcotic drugs will alter pituitary function, while alcohol injures the testes to cause low t.

Sleep Deprivation: Besides aging, the two most common causes i see of secondary hypogonadism are sleep deprivation and vegetarianism. So, get a good night's sleep and eat meat.

Other Causes: History of traumatic brain injury aka TBI, concussions, and chronic opiate use also can cause low T.

Low Testosterone: One of the most common causes I see for low testosterone is Obesity. With Obese patients , testosterone is peripheral converted to estrogen in the adipose tissue leading to a state of low testosterone and high estrogen. Weight loss often corrects low testosterone and normalizes estrogen levels in men.

Multiple: Aging, Trauma to testes Testicular atrophy, Adrenal disease And more hormonal or chemical,problems.