There are so many things that could cause excessive hair loss. A major illness like cancer or a surgery can cause a large amount of hair to fall. However, this is temporary. After recovery from the stress of the illness, the hair growth cycle could be restored to normal.

Hormonal imbalances like in the thyroid gland can also cause excessive hair loss. An overactive or inactive thyroid can cause your hair fall. Also the imbalances in the female hormone estrogen and male hormone androgen are also known to be causes of hair loss. It is only when the imbalances are corrected that the hair loss may stop.

Another cause that is still related to hormonal imbalances is experienced by women after giving birth. During pregnancy, the body produces hormones that keep the hair of the mother from falling and disturbs the cycle. However, three months after child birth, the cycle goes back to normal.

Some medicines like anticoagulants, birth control pills antidepressants and excessive vitamin A can also call massive hair fall. Fungal infections in the scalp are also one cause; though it is not proven that dandruff, a scalp ailment cause by fungi, is directly related to hair fall.