Thinning hair isn't one condition — it's a symptom that shows up for a lot of different reasons, and the cause matters for figuring out what will actually help. Here are six of the most common ones, in men and women alike.
1. Androgenetic alopecia (pattern hair loss)
The most common cause of hair thinning in both men and women, driven by genetics and hormones. In men it usually shows up as a receding hairline and crown thinning; in women it more often shows up as diffuse thinning and a widening part, with the hairline usually staying intact.
Right now: hair building fibers blend into existing hair to instantly reduce the appearance of scalp show-through.
Long term: talk to a dermatologist about options, and pay attention to overall scalp and nutritional health — we're expanding into hair-health supplements to support this soon.
2. Telogen effluvium
A temporary, diffuse shedding triggered by physical or emotional stress, illness, surgery, or a major life change — hair enters its "resting" phase early and sheds a few months later. It usually resolves on its own once the trigger passes.
Right now: fibers cover thin patches while hair regrows.
Long term: addressing the underlying stressor and supporting your body's recovery (sleep, nutrition, stress management) is usually the real fix here.
3. Alopecia areata
An autoimmune condition where the immune system attacks hair follicles, causing round, well-defined patches of hair loss. This one needs a real diagnosis — a dermatologist can confirm it and discuss treatment options.
Right now: fibers can help even out coverage in patchy areas between appointments.
Long term: this is a medical condition that benefits from professional care — please see a dermatologist rather than relying on cosmetic products alone.
4. Traction alopecia
Caused by consistent tension on the hair — tight ponytails, braids, extensions, or buns pulling on the same spots over time. It's common along the hairline and part.
Right now: fibers fill in thinned edges while you adjust your styling.
Long term: loosening up your go-to hairstyles and giving stressed areas a break is what actually allows regrowth.
5. Postpartum hair loss
A specific, very common form of telogen effluvium: pregnancy hormones extend hair's growth phase, so more sheds at once after birth as hormones rebalance. It typically peaks a few months postpartum and resolves within a year.
Right now: fibers are an easy, safe way to feel like yourself during the shedding phase.
Long term: this one is usually temporary — patience, and good overall nutrition, go a long way.
6. Age-related thinning
Hair naturally gets finer and grows more slowly with age for both men and women, independent of pattern baldness. It's gradual and affects nearly everyone eventually.
Right now: fibers add visual density instantly, no matter the cause.
Long term: a healthy scalp environment and good nutrition support the hair you have.
This article is for general information only and isn't a substitute for medical advice. If you're experiencing sudden, patchy, or unexplained hair loss, please see a dermatologist for an accurate diagnosis.
Whatever the cause, an instant fix while you figure out the rest can help — Sevich Hair Building Fibers covers thinning spots in under 30 seconds, undetectably.