Hair loss affects at least a third of women. But unlike men, women typically experience thinning hair without going bald, and there can be a number of different underlying causes for the problem.

Numerous problems can trigger female hair loss. Some are external, such as taking certain medications, frequently wearing hairstyles that pull the hair too tight, or even a stressful event such as surgery. In other cases, thinning hair is triggered by something going on inside the body — for instance, a thyroid problem, a shift in hormones, a recent pregnancy, or an inflammatory condition.

Hair loss may also be genetic. The most common genetic condition is known as androgenetic alopecia or pattern hair loss. Women with this condition might notice a widening of the part at the top of the head, often beginning when a woman is in her 40s or 50s. You might experience this if you inherit certain genes from one or both parents. Hormonal shifts that occur during menopause may also spur it.

Another trigger for hair loss in women is an inflammatory condition affecting the scalp. That might be eczema, psoriasis, or a condition called frontal fibrosing alopecia, which typically causes scarring and hair loss — sometimes permanent — at the front of the scalp above the forehead.

Other common causes of hair loss include overuse of damaging hair products, or tools such as dryers and other devices that heat the hair. Underlying illness, autoimmune conditions such as lupus, nutritional deficiencies, or hormonal imbalances may also cause hair to shed.

There are effective treatments for women experiencing hair loss, from over-the-counter topical therapies to prescription medications or in-office procedures. If you are experiencing hair thinning, please visit your healthcare provider to discuss treatment alternatives.