Hair fall can have as many reasons as we can think of. The most common being genetic which can be modified by the environment we live. If there is a family history of hair loss, then it becomes more likely. Meet a Dermatologist for beginning a treatment plan. The treatment typically consists of usage of oral medication (Finasteride) and topical lotion (Minoxidil ). The dosage and duration is decided by your dermatologist. Have patience as initial improvement takes few months to be visible though hair loss should stop in a couple of weeks,