There are many types of factors which could lead to hair thinning. Such factors include exposure to pollution, heat damage and deficiency of proper nutrition. Sometimes, individuals may be genetically predisposed to having thin hair. Such factors can lead to hair fall and prevent your hair from getting long as they will shed after some time. There are many factors which can actually inhibit hair growth. Most commonly, our hair is prone to breakage which prevents them from growing any further. Constant use of heating tools like straighteners and hair curlers can damage the hair and lead to split ends. Lack of proper nutrition can prevent the growth of new hair follicles and therefore cause hair to grow out thin and limp.