What causes excessive hair loss?

A number of things can cause excessive hair loss

As we age, the hair re-growth process may slow or stop, and thinning or baldness areas may occur. However, there are many abnormal conditions to cause hair loss prematurely. Following are some questions to consider:
How much hair is being lost?
Is your hair falling out in small patches?
What genetics traits may cause the hair loss?
Why women develop male pattern baldness?
Where any chemicals used on the hair to cause the hair to falls out?
Are you taking any new medicine, steroids or chemotherapy to cause hair loss condition?
As a woman in menopausal stage, are hormonal imbalance may cause the hair loss?

Androgenetic alopecia condition, is one of the most common causes of hair loss. Telogen effluvium condition is also common as a loss of "handfuls" of hair. In most cases the condition appear following emotional or physical stress. A doctor diagnosis is best to determine the cause of why your hair falls out.