Hair falls out every day as part of the body’s natural renewal cycle. The American Academy of Dermatology note that it is normal for a person to lose about 50–100 hairs each day.
Each hair follicle goes through a cycle that includes a growth stage (anagen) and a rest stage (telogen) before the hair falls out. This cycle repeats itself for as long as the hair follicle remains active and continues to produce new hairs.
Most healthy people have between 80,000 and 120,000 hairs on their head. The authors of a 2017 study note that up to 9% of the hair follicles are in the resting stage at any given time, which means that they are ready for the strand to fall out.
People with shorter hair may not notice significant shedding, but those with longer hair tend to see hairs in the shower drain or on hairbrushes and clothing.
People who style their hair may also lose more of it. According to 2018 research, approximately 40% of women experience excessive hair shedding when styling their hair, which includes brushing it.
The authors of a more recent study from 2019 claim that 40% of women experience excessive hair shedding when shampooing their hair.
Chemical dyes, heated curlers and straighteners, and excessive hair brushing can all lead to extra hair shedding or breaks in the hair.
Anyone experiencing a significant change in the amount of hair that they shed may wish to see a doctor or dermatologist to help identify any issues.
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