Normal testosterone production in men is important for libido and sexual function, muscle and bone mass, normal mood and well-being.
A low testosterone (hypogonadism) can be due to several causes including testicular disease, pituitary gland disease, in response to general poor health in the body or associated with other conditions such as Obstructive Sleep Apnoea, Obesity, Type 2 Diabetes Mellitus
Endocrinologists are specialists at investigating the cause of hypogonadism and instituting the most appropriate therapy, which can include testosterone replacement therapy.