Men are generally more likely to lose their hair than women are, but it can be a serious issue for both sexes and there are a whole host of reasons as to why hair loss occurs, from simple and temporary ones, to more complicated reasons. Here are just a few examples:

Genetics
The chances are that if your father and grandfather or mother and grandmother experienced hair loss, then as you grow older, you will too; a simple case of genetics.

Male pattern baldness
Hair loss or baldness is experienced by 2 out of 3 men before they reach the age of 60 years, and it is often due to male pattern baldness. This particular type of hair loss is caused by a combination of genes and the male sex hormone, and commonly follows a pattern whereby hair begins to recede at the temples and leaves an M-shaped hairline.

Female pattern hair loss
Otherwise known as androgenic or androgenetic alopecia, is the female version of male pattern baldness.

Physical stress
Physical trauma, such as a car accident, major surgery or even an illness like the flu, can cause a temporary loss of hair for both men and women. The traumatic event goes on to trigger a type of hair loss called telogen effluvium.

Pregnancy
This could also be classed as a form of physical stress or trauma that can trigger hair loss in women, and the change in hormones during pregnancy can also cause a loss of hair. It is more common to see such hair loss after the delivery of the baby as opposed to during the pregnancy.

Too much vitamin A
The American Academy of Dermatology have stated that taking too many supplements or medications containing vitamin A, can lead to hair loss.

Not enough vitamin B
While this may not be an issue for many people, having low levels of this particular vitamin can trigger a hair loss episode.

Poor diet and lack of exercise
Not having a good balanced diet consisting of a variety of fruits, vegetables, eggs and protein based foods, can cause hair loss in some people. Not taking regular exercise (30 minutes of cardiovascular exercise at least 3 times a week) can also be a trigger for hair loss.

Certain medications
Blood thinners and blood pressure drugs (beta-blockers) are known to be among some of the more commonly used medications that can promote hair loss in both men and women.