As a person grows older, they often start to lose hair volume or thickness or both. The commonest reasons for hair thinning are:
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genetic or hereditary factors, which health experts call androgenetic alopecia
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older age, due to slower hair growth
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alopecia areata, which is an autoimmune condition
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scarring alopecia, where inflammation destroys hair follicles
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cancer treatment and some other medications
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childbirth
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hair treatments, such as perms, dyes, and hair relaxants
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pulling or tugging the hair, for example, when styling or to relieve stress
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hormonal changes, possibly due to a thyroid condition or menopause
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a health condition, such as scalp psoriasis or an infection
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nutritional deficiencies, for example, a lack of biotin, zinc, iron, or protein
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poisoning with arsenic, thallium, mercury, or lithium
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With a combination of proper nutrition and Hair regrowth treatments, hair thinning can be reversed.