Hair thinning can represent many things about your health, from a symptom of a poor diet to a serious medical condition. Hair thinning and loss can be a part of your genetics, or it can be caused by overusing styling products and heat tools.
Alopecia
Alopecia is an autoimmune disease that causes your hair to thin and eventually fall out at the crown or sides of your scalp.
Chemical hair products
Chemical hair products, including dye, bleach and relaxers can weaken the bonds of your hair, which leaves your hair prone to breakage and brittleness.
Diet
A diet that is lacking in protein can cause hair thinning and loss. Protein is an essential nutrient that maintains the hair's health.
Heat damage
Heat damage from curling irons, flat irons, blow dryers or even hot water can lead to hair thinning.
Medication
Medications used to treat depression, high blood pressure and arthritis can cause hair thinning and loss.
Hormones
Hormonal changes that occur during pregnancy, menopause or a thyroid disorder can cause hair thinning, according to the Mayo Clinic.
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