The most common causes of hair fall are noted here
Genetics: Yes, you knew it all along: It's Mom's (or Dad's) fault that you have no hair. The overwhelming majority (up to 98 percent) of men with balding fall into the genetic category. Female genetic balding occurs much less frequently, but up to 50 percent of women have hair fall related to their inherited genes.The good information is that only seven percent of men develop the most advanced balding pattern (left with just a 3 inch wreath of hair around the side and back of the head). If you've inherited this pattern, it's usually apparent by the time you're 30. Genetic hair loss in men commonly falls into one of many distinct hair loss patterns identified under the Norwood classification system . In balding men, the hair around the sides of the head almost always retains a normal, thick appearance. In women, genetic hair loss is different; for one thing, it tends to occur as overall hair thinning (including the sides of the head) rather than fall of hair on certain areas of the head.
Diseases: A number of diseases as well as hormonal influences, including thyroid disease and anemia, cause hair loss. Autoimmune disease also can cause patchy hair loss.
Mechanical causes: Mechanical hair loss is caused by outside forces such as tight braiding, rubber banding, turbans, or other hair torture devices that put stress and strain on your hair.
Stress: In some cases, stress can aid to hair loss in those who are genetically predisposed to it or can result in a sudden loss of hair in a condition called telogen effluvium
Medications: Many medicines, most notably anabolic steroids, family planning pills, antidepressants, and tranquilizers, can cause hair loss.
Author Resource:
In the action of caring for our hair, we do many harmful things to it, from combing it the wrong way to coloring it with harsh chemicals or subjecting it to strong sunlight. If you're starting to fall your hair, it's important to take the best possible care of the hair you still have.