Testosterone hormone is very essential for the normal functioning of the body. Testosterone is found in men and is responsible for male characteristics in the body. It is essential for male type hair distribution and sexual drive. It also maintains muscle tone, fat distribution, and bone strength. Some psychological functions and other activities such as sleep are also dependent on the testosterone levels in the body.
 

The lower normal limit of testosterone in the blood is 300 nanograms per deciliter. The most common among the many reasons of low testosterone is advancing age. The other reasons for low testosterone can be the presence of tumor in the pituitary gland or infection and injury of the testicles. Psychological stress and alcohol consumption are other reasons for low testosterone levels. Other reasons for low testosterone could be that the testes produce it in low levels, or some medical illnesses like obesity, diabetes, and kidney disorders.
 

The primary symptoms of low testosterone levels are reduced sexual desire and depression. Erectile dysfunction is often attributed to low testosterone levels in the blood. In men who are otherwise healthy and do not have diabetes and high blood pressure, the reason for erectile dysfunction can be attributed to low testosterone. Other signs and symptoms of low testosterone are uneven distribution of fat in the body and change in sleep quality.

Men with low testosterone often show deposition of fat at the chest and hips and sleeplessness. Some men with low testosterone also show signs such as gynecomastia or enlarged breast. The reason for female type fat distribution in men is associated with low testosterones. Often, these symptoms lead them to depression.
 

Depression and reduced motivation to work are among the important signs and symptoms. Among the many reasons of depression, low testosterone is a major one. Scientific studies have proven that men with low testosterone levels are often prone to depression. People with depression lack interest in new activity and take more than usual time in completing day-to-day activities. Depression causes aloofness in men. These depression symptoms often improve with testosterone therapy.
 

Heart diseases, mainly worsening of congestive heart failure, are often dangerous signs and symptoms of people with low testosterone.
 

One of the reasons of low energy or physical endurance is low testosterone. Reduced muscular strength and bone mass are other signs and symptoms of low testosterone levels in men. Such men feel weak even after light exertion.
 

It is necessary to evaluate these signs and symptoms in context with the testosterone levels in the blood. Mere presence of these signs and symptoms do not recommend starting of testosterone therapy.