Hair loss in children most often comes from one of four conditions: a fungal scalp infection, an autoimmune disorder called alopecia areata, physical damage from hairstyling or hair-pulling habits, or stress-triggered shedding known as telogen effluvium. While seeing your child lose hair can be alarming, most of these causes are treatable and many resolve on their own.
Fungal Scalp Infection (Tinea Capitis)
Tinea capitis is a fungal infection of the scalp and one of the most common reasons children lose hair. In the United States, over 90% of cases are caused by a single fungal species called Trichophyton tonsurans. It spreads easily between children through shared combs, hats, pillows, and direct contact, which is why it’s particularly common in school-age kids.
The classic sign is one or more scaly patches on the scalp where hair has broken off or fallen out. Sometimes the patches show tiny black dots, which are hair shafts that have snapped at the surface. The scalp often itches. In more severe cases, a painful, swollen lump called a kerion can form, with pus and crusting. Kerions can lead to permanent scarring if not treated promptly. Milder cases may look like nothing more than widespread dandruff with subtle thinning.
Because the fungus lives inside the hair shaft, topical creams alone won’t clear it. Oral antifungal treatment is needed, typically for several weeks. With proper treatment, hair regrows fully in most children.
Alopecia Areata
Alopecia areata is an autoimmune condition where the body’s own immune cells attack hair follicles during their active growth phase. Immune cells cluster around the base of the follicle, disrupting its normal cycle, causing hair to fall out prematurely and preventing new growth from starting. The condition has a genetic component: children with a family history of alopecia areata are significantly more likely to develop it, with some studies estimating the risk at 10% to 50% in those with affected relatives.
It typically appears as one or more smooth, round bald patches with no redness, scaling, or scarring. The skin underneath looks completely normal, which is one of the key ways to tell it apart from a fungal infection. A telltale clue is “exclamation point hairs,” short broken hairs that are narrower at the base, visible around the edges of a patch. Many children with alopecia areata also develop small pits or ridges in their fingernails.
The condition peaks around age 12 in boys and age 9 in girls. It often overlaps with other immune-related conditions like eczema, thyroid disease, and vitiligo. Hair may regrow spontaneously, but the course is unpredictable. Some children experience a single episode, while others have recurring patches over months or years.
Traction Alopecia From Hairstyling
Constant pulling on the hair from tight hairstyles damages follicles over time. Tight ponytails, buns, braids, cornrows, locs, extensions, and weaves are the most common culprits. The risk increases significantly when tight styles are applied to hair that’s already been chemically treated with relaxers, perms, or texturizers, because chemically processed hair breaks more easily under tension.
Hair loss from traction typically shows up along the hairline and temples, wherever the pull is greatest. One characteristic sign is the “fringe sign,” where a thin line of shorter hairs is preserved right at the front of the hairline while the hair behind it thins or disappears. You might also notice small bumps, pain, stinging, or crusting around the follicles after styling. These are warning signs that the tension is too high.
The critical thing to know: if traction alopecia continues for a long time, the follicles can become permanently damaged and hair won’t grow back. Caught early, switching to looser styles allows full recovery. Alternating hairstyles, avoiding constant tension in the same spots, and skipping chemical treatments that weaken the shaft all help prevent lasting damage.
Trichotillomania (Hair-Pulling Disorder)
Trichotillomania is a body-focused repetitive behavior where a child repeatedly pulls out their own hair. It can target the scalp, eyebrows, or eyelashes. Some children do it deliberately as a way to cope with stress, anxiety, boredom, or frustration. Others do it automatically, without even realizing it, while reading, watching TV, or falling asleep.
The hair loss pattern often looks irregular and patchy, with hairs broken at different lengths in the affected area. Children may develop rituals around pulling, like searching for a specific type of hair or pulling in a particular pattern. Related behaviors are common: skin picking, nail biting, lip chewing, or even pulling fibers from blankets and clothing. Some children bite or chew the pulled hair.
Because pulling usually happens in private, parents may not witness it directly. The key distinction from medical causes of hair loss is that the patches tend to have an unusual shape, the scalp skin looks normal, and hairs of varying lengths are visible in the thinning area rather than the clean smooth patches of alopecia areata or the scaly patches of a fungal infection. Behavioral therapy, particularly a technique called habit reversal training, is the primary approach for managing trichotillomania.
Telogen Effluvium: Stress-Related Shedding
Telogen effluvium happens when a physical or emotional shock pushes a large number of hair follicles into their resting phase all at once. About three months after the triggering event, those hairs fall out together, causing noticeable thinning. Common triggers in children include high fevers, severe infections, major surgery, significant psychological stress, thyroid problems, and nutritional deficiencies.
Unlike the other causes on this list, telogen effluvium doesn’t produce bald patches. Instead, the hair thins diffusely across the entire scalp. Parents often notice it as a thinner ponytail or more hair on the pillow and in the shower drain. The scalp itself looks normal with no redness, scaling, or scarring.
The reassuring part: once the underlying trigger is resolved, shedding typically stops within three to six months. It can then take another six months for hair density to return to normal. If shedding continues beyond six months, it’s classified as chronic telogen effluvium and may need further evaluation.
Nutritional Deficiencies
Poor nutrition can contribute to hair loss in children, though it’s less common than the conditions above. Nutritional deficiencies are listed as a recognized trigger for telogen effluvium, meaning they can push hair into a shedding phase. Iron deficiency is the most frequently discussed nutritional link to hair loss in children, particularly in picky eaters or children with restricted diets. Zinc and vitamin D deficiencies have also been associated with thinning hair, though the evidence is less definitive.
Nutritional hair loss tends to cause generalized thinning rather than distinct bald spots. If a child’s diet is significantly limited, or if they have a condition that affects nutrient absorption, blood work can identify deficiencies that may be contributing to the problem.
How Doctors Tell These Apart
The pattern, location, and appearance of hair loss usually point toward the cause. Fungal infections produce scaly, sometimes itchy patches. Alopecia areata creates smooth, round bald spots on otherwise normal-looking skin. Traction alopecia follows the hairline where tension is applied. Trichotillomania creates irregularly shaped patches with hairs of varying lengths. Telogen effluvium causes diffuse, all-over thinning.
Dermatologists use a few specific tools to confirm the diagnosis. A hair pull test, where a small group of hairs is gently tugged, can reveal how many are in the shedding phase. A dermatoscope, essentially a magnifying device, can identify characteristic signs like the comma-shaped and corkscrew hairs of a fungal infection, or the exclamation point hairs and yellow dots of alopecia areata. For fungal infections, a culture of the scalp may be taken. In uncertain cases, a small skin biopsy from the edge of a bald patch can show whether inflammation or changes in the hair growth cycle are present.