Why does it happen?
There are many reasons why we lose hair: hormone changes during pregnancy or the menopause, nutritional factors such as crash-dieting or periods of illness, medication, and scalp damage or disease.
In men, hair loss is commonly genetically inherited, known as androgenetic alopecia, or male pattern baldness.
Hair disappears from the temples and crown of the head, usually when men are in their 20s and 30s. It is caused by the conversion of the male sex hormone testosterone to another hormone, dihydrotestosterone (DHT), which causes the hair follicles to make thinner and thinner hair.
Women are also affected, with 40 per cent showing signs of thinning by the age of 60. Generally, hair is lost all over the front of the scalp and the sides of the head, but remains thick at the back.