Dermatologist Explains Eight Possible Causes Behind Sudden Bald Patches

A sudden bald patch or rapid increase in hair loss can be concerning and should not simply be covered up with cosmetic products. Dermatologist Dr Amulya Ramamurthy of Apollo Hospitals, Bengaluru, said sudden hair loss can sometimes indicate an abrupt change in the body's internal systems. Identifying the underlying cause is important because different types of hair loss require different approaches to treatment.

One possible cause is alopecia areata, an autoimmune condition in which the immune system mistakenly attacks hair follicles. It commonly produces smooth, round patches of hair loss that can develop over days or weeks. Another possibility is a fungal infection such as ringworm, which may cause a defined area of hair loss accompanied by redness, itching, scaling or swelling. Unlike some other forms of hair loss, fungal infections generally require prompt diagnosis and antifungal treatment.

Extreme physical or emotional stress can also trigger significant hair shedding. Events such as severe illness, major surgery or other intense stressors may cause noticeable hair loss several months after the trigger. Nutritional deficiencies are another potential factor, particularly severely low levels of iron, protein, zinc or vitamin D. Such problems may occur after restrictive diets and can affect the health of hair follicles, leading to widespread thinning or, in some cases, patchy loss.

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The dermatologist also highlighted excessive supplementation as a possible contributor. Taking very high amounts of nutrients such as vitamin A, selenium or vitamin E may itself be associated with hair loss. Another condition, trichotillomania, involves repeatedly pulling out one's own hair, often in response to stress, and can result in visible thinning or bald patches. Hormonal changes can also alter the hair-growth cycle and lead to sudden shedding.

Certain medications may additionally cause hair loss as a side effect. Because there are several possible explanations, trying to determine the cause through home remedies alone can delay appropriate treatment. A dermatologist can examine the scalp and hair pattern and, when necessary, recommend blood tests or other investigations to identify nutritional, hormonal or medical factors contributing to the problem.

The key message is that sudden or unexplained hair loss should not be ignored. The treatment depends on the underlying cause, so there is no single remedy that works for every type of bald patch. Instead of relying on temporary fixes or self-treatment, people experiencing sudden hair loss should seek professional evaluation to establish the cause and determine the appropriate course of care.

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