As a person grows older, they often start to lose hair volume or thickness or both. The commonest reasons for hair thinning are:

• genetic or hereditary factors, which health experts call androgenetic alopecia

• older age, due to slower hair growth

• alopecia areata, which is an autoimmune condition

• scarring alopecia, where inflammation destroys hair follicles

• cancer treatment and some other medications

• stress

• childbirth

• hair treatments, such as perms, dyes, and hair relaxants

• pulling or tugging the hair, for example, when styling or to relieve stress

• hormonal changes, possibly due to a thyroid condition or menopause

• a health condition, such as scalp psoriasis or an infection

• nutritional deficiencies, for example, a lack of biotin, zinc, iron, or protein

• poisoning with arsenic, thallium, mercury, or lithium

• taking a high dose of vitamin A or selenium supplements

​

With a combination of proper nutrition and Hair regrowth treatments, hair thinning can be reversed.