What Causes hair loss?

According to Wikipedia, hair loss, also known as alopecia or baldness, refers to a loss of hair from part of the head or body.
Hair loss in some people causes psychological distress. Common types include male-pattern hair loss, female-pattern hair loss, alopecia areata, and a thinning of hair known as telogen effluvium.

The following are common causes of hair loss:

Family history (heredity). The most common cause of hair loss is a hereditary condition that happens with aging. …
Hormonal changes and medical conditions. …
Medications and supplements. …
Radiation therapy to the head. …
A very stressful event

Hair loss treatment may be different from men and women, find out more detail below:

Hair loss for men