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Why Do Women Shed Hair?

Hair shedding is the process by which hair on the head is lost and replaced with new hair growth. It is a natural, ongoing process for both men and women, but may be more frequent in women due to the variety of potential causes of shedding. Women who notice significant shedding for a period of time that is not followed by new hair growth should consult with a health care provider for a professional diagnosis and possible treatment options.

  1. Hair Life Cycle

    • Women's hair undergoes a normal cycle of hair growth and shedding, according to FamilyDoctor.org. The growth cycle lasts for approximately 2-3 years and makes up about 90 percent of the hair on a woman's head at any given time. The remaining 10 percent of hair is not growing, but is in a resting phase. After 3-4 months in the resting phase, the resting hair will shed and be replaced by new growing hair.

    Unbalanced Diet

    • Women who eat a diet high in fruits and vegetables and low in red meat or protein may notice increased hair shedding, according to the American Hair Loss Association. The insufficient amount of iron in a primarily vegetarian diet can lead to an imbalance of the nutrients that are required for healthy hair growth and maintenance. Additional deficiencies that can increase hair shedding include zinc, amino acid L-lysine, and vitamins B6 and B12.

    Hormonal Imbalance

    • Hormonal imbalances, such as those associated with an overactive or underactive thyroid, may cause hair shedding in women, according to FamilyDoctor.org. Successful treatment of the condition with prescription medications can help correct the hormonal imbalance and stop the shedding. Also, the American Hair Loss Association states that postpartum women may notice significant hair loss or shedding approximately 3 months after delivery. As a woman's hormones return to pre-pregnancy levels, her hair sheds and the growth cycle of hair begins again.

    Surgery, Illness or Medications

    • Women who have undergone surgery or significant illness may notice an increase in hair shedding 3-4 months after the event, according to the American Hair Loss Association. Shedding of this type is most likely stress-induced and will last only a short period of time. After the shedding has stopped, hair will begin to regrow. Additionally, certain medications may cause hair to shed unexpectedly. Medications such as blood thinners, high blood pressure medications, birth control, antidepressants or an excessive amount of vitamin A can cause hair shedding. Hair loss will generally improve if the medication is stopped.

    Hairstyles

    • Women who receive hot oil treatments or perms may cause their hair follicles to swell, which can result in hair shedding, according to FamilyDoctor.org. Additionally, using tight hair rollers or pulling the hair back in a ponytail can cause scarring and hair loss. Hair shedding caused by hairstyles or styling products can result in scarring and permanent hair loss.

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