Most people routinely lose between 70 and 100 hairs from their scalp each day, mainly through washing, brushing, and combing.

Scalp hair starts to thin when more hairs are lost through normal shedding than the scalp is able to renew. About 40% of the density of scalp hair has to be lost before thinning of the hair becomes noticeable.

• Heredity. Most balding is caused by a genetic predisposition – in other words, it’s part of a person’s genetic makeup. This is called male pattern baldness, or hereditary balding or thinning. It is the most common cause of thinning hair.
• Illness, certain physical conditions, or their treatments.
• This can include high fever, thyroid disease, childbirth, inadequate protein in the diet, iron deficiency, cancer treatments, the use of certain medications, and other causes.