National Hair Loss Awareness Month is an ideal time to learn about the most common causes of hair loss and hair thinning. Millions of men and women experience hair loss each year, and the good news is that many forms can be successfully treated when diagnosed early.
The most common cause of hair loss is male and female pattern hair loss (androgenetic alopecia), an inherited condition that causes gradual thinning over time.
The second most common cause is damage from excessive heat and chemical treatments. Frequent bleaching, coloring, straightening, perming, tight hairstyles, and repeated use of high-heat styling tools can weaken the hair shaft, leading to breakage and visible thinning.
Another important cause of hair loss is medical conditions, medications, nutritional deficiencies, and poor diet. Thyroid disorders, iron deficiency, rapid weight loss, significant illness, and certain prescription medications can trigger excessive shedding. Inadequate protein intake and other nutritional deficiencies may also contribute to hair loss.
Less commonly, primary scalp diseases cause hair loss. These include alopecia areata, an autoimmune disorder, and inflammatory conditions that may produce permanent scarring, including lichen planopilaris, frontal fibrosing alopecia, central centrifugal cicatricial alopecia (CCCA), and folliculitis decalvans. Early diagnosis and treatment are critical to preserving hair.
Fortunately, effective hair loss treatments are available for nearly every type of hair loss. Depending on the diagnosis, treatment may include medications, topical therapies, oral medications, regenerative procedures, nutritional optimization, or treatment of an underlying medical condition.
If you notice increased hair shedding or thinning, schedule an evaluation with a board-certified dermatologist. A careful history, scalp examination, and, when appropriate, laboratory testing can identify the underlying cause and guide treatment. If you cannot see a dermatologist promptly, discuss your concerns with your primary care physician so they can evaluate for medication side effects, medical conditions, dietary factors, and nutritional deficiencies that may be contributing to your hair loss. Early evaluation offers the best opportunity for successful treatment.
