Hair fall can be caused due to several factors. But first, it is important to know what is normal hair loss? This is the hair loss that everybody has and the number of hair falling everyday vary from ten to hundred. Many people mistake this as hair loss and go to the doctor. It is very important to realize that this is normal and does not need treatment. In addition, hair loss can be classified as localized loss and generalized loss - as temporary hair loss and permanent hair loss. Most causes for hair loss do not result in baldness, and the common condition that we see as baldness is refered to as common baldness. Causes such as systemic diseases, local skin diseases, emotional stress, endocrine problems, anemia, vitamin deficiency, drugs, cancer, rheumatic disease can cause hair loss but most of these are temporary and once the primary condition is treated, the hair returns.