Low libido is decreased interest in sexual activity.

Sometimes it is an underlying factor of health conditions but other times it could be environmental problems.

A lack of interest in sex isn't a direct indication of a loss of interest in a partner. It just shows that there is something the partner is going through.

Here are 8 common causes of low libido in men.

1. Low testosterone

Testosterone is the hormone responsible for building muscles, bone mass and stimulating sperm production.

Low testosterone leads to lower desire for sex.

2. Medication

Some drugs, such as blood pressure medication have agents in them that may prevent ejaculations or impede maintaining an erection.

3. Restless leg syndrome

RLS is an uncontrollable urge to move your legs. Men with RLS have a higher risk for developing Erectile Dysfunction, according to Healthline.com.

4. Chronic illness

Some sicknesses such as cancer can lead to lower sperm production. And may inhibit anyone's interest in any rigorous activity such as sex.

5. Depression

This can lead to a complete lack of interest in activities people once found pleasurable.

6. Lack of sleep

A lack of a good night's rest caused by sleep apnea or insomnia can lead to lower testosterone levels.

7. Aging

Men experience their highest testosterone levels when they are teenages. As they grow older, lower levels of testosterone are produced.

8. Stress

Situations that are of high pressure or cause a lot of emotional  turmoil cause a lot of stress. This in turn can lead to disrupted hormone levels.