Hair loss and Hair fall are two separate things. Hair fall is a natural daily occurrence. Human head contains over 100,000 hairs and one normally sheds 100 to 150 hairs a day, every hair is genetically programmed. In general 85% of the hair on your head grow approximately one centimeter per month for about 2 to 6 years and then fall off. Hair loss is primarily caused by a combination of ageing, a change in hormones and a family history (genetic) of baldness.