Hair loss has multiple causes, and the right approach depends on what’s driving yours. For the most common type, pattern hair loss, treatments like topical minoxidil and prescription medications can slow thinning and regrow hair in a majority of users. But before jumping to products, it’s worth understanding why your hair is thinning in the first place, because some causes resolve on their own while others need targeted intervention.
Figure Out What’s Causing It
The single most useful thing you can do is identify the type of hair loss you’re dealing with. Pattern hair loss (the gradual thinning at the temples, crown, or part line) is the most common form and is driven by genetics and hormones. A hormone called DHT shrinks hair follicles over time and shortens the growth cycle, producing thinner, shorter hairs until the follicle stops producing visible hair altogether. This process is gradual and progressive, meaning earlier intervention gets better results.
Temporary hair shedding, called telogen effluvium, is the second most common cause. It happens when a physical or emotional stressor pushes a large number of hair follicles into their resting phase at once. Common triggers include childbirth, high fever, severe infections, major surgery, thyroid problems, psychological stress, crash diets low in protein, and stopping birth control pills. This type of shedding typically lasts three to six months and resolves on its own once the trigger passes. If your hair loss started suddenly a few months after a major life event or illness, this is likely what you’re dealing with.
Other causes include autoimmune conditions like alopecia areata (which creates patchy bald spots), scalp infections, and nutritional deficiencies. A dermatologist can usually tell the difference with a visual exam, and sometimes a scalp biopsy or blood work.
Check Your Nutrient Levels
Low iron is one of the most underdiagnosed contributors to hair loss, particularly in women. Standard lab ranges consider ferritin (your stored iron) “normal” at 15 to 30 ng/mL, but hair specialists use a higher bar. Levels below 30 ng/mL are highly likely to contribute to hair loss. The 40 to 70 ng/mL range is considered the minimum for healthy hair, and levels above 70 ng/mL are optimal for growth.
Vitamin D deficiency also shows up frequently in people with hair loss. Zinc and biotin play supporting roles in the hair growth cycle as well. If you suspect a deficiency, a simple blood panel can confirm it, and correcting the deficiency through diet or supplements often improves shedding within a few months. Taking hair growth supplements without a confirmed deficiency, though, is unlikely to make a meaningful difference.
Topical Minoxidil
Minoxidil (sold as Rogaine and many generics) is the most accessible treatment for pattern hair loss. It’s available over the counter in 2% and 5% concentrations and works by increasing blood flow to hair follicles and extending the growth phase of the hair cycle. You apply it directly to the scalp once or twice daily.
Results take patience. In a study of men using 5% minoxidil, about 14% noticed results in the first month, 52% during the second month, and 34% during the third month. After four months, roughly 63% of men rated the treatment as effective or very effective. After a full year of consistent use, that number held, with about 64% rating it effective or very effective and around 16% finding it ineffective. It works for women too, though the 2% formula is more commonly recommended. The catch: if you stop using it, new hair growth is lost within about a year.
Prescription Options
For pattern hair loss that minoxidil alone can’t manage, prescription medications target the hormonal root of the problem.
Finasteride is an oral pill that lowers DHT levels by blocking the enzyme that produces it. It takes at least three months to see an effect, and like minoxidil, the results only last as long as you keep taking it. Hair regrown through finasteride is lost within a year of stopping. The most commonly reported side effects are sexual in nature: reduced libido and difficulty with erections. These affect a minority of users and typically resolve after stopping the medication, though a small number of men report persistent effects.
For women, spironolactone is sometimes prescribed off-label. It blocks the activity of androgens (the hormones that drive follicle miniaturization) and has traditionally been used at doses of 100 to 200 mg daily. More recent clinical experience suggests that lower doses, averaging around 35 mg daily, can also be effective for female pattern hair loss.
In-Office Treatments
PRP Therapy
Platelet-rich plasma therapy involves drawing a small amount of your blood, concentrating the growth factors in a centrifuge, and injecting the result into your scalp. The idea is that these growth factors stimulate dormant follicles and improve hair density. In one small study, PRP injections given every two weeks for three months increased the average number of follicles per area from 71 to 93 units. Other studies have shown improvements in hair count, thickness, and root strength over similar timelines. It typically takes several sessions to see initial results, and maintenance treatments are needed to sustain them. PRP is not covered by insurance and can cost several hundred dollars per session.
Low-Level Light Therapy
Laser caps and helmets use specific wavelengths of red light (630 to 670 nanometers) to stimulate cellular activity in the scalp. This is an FDA-cleared treatment for pattern hair loss that has been shown to improve both hair thickness and density. Devices vary widely in quality. Those delivering light in the 630 to 670 nm range with adequate power output produce the best results. You use them at home for several minutes a few times per week. Results are modest compared to medication but can complement other treatments with essentially no side effects.
Hair Transplant Surgery
When hair loss is advanced and follicles are no longer responsive to medication, transplant surgery moves hair from thicker areas (usually the back and sides of the scalp) to thinning areas. The two main techniques are FUE, which extracts individual follicles, and FUT, which removes a strip of scalp tissue and dissects it into grafts.
FUE leaves tiny dot scars scattered across the donor area and has a faster recovery of about 7 to 10 days. FUT leaves a single linear scar and takes 10 to 14 days to recover from, but it can harvest more grafts in a single session. Both methods produce permanent results because the transplanted hair follicles are genetically resistant to DHT. Costs range widely depending on the number of grafts, the surgeon’s experience, and geographic location, but most procedures run several thousand dollars and are not covered by insurance. Many surgeons recommend continuing minoxidil or finasteride after a transplant to protect the non-transplanted hair from further thinning.
Lifestyle Changes That Support Hair Growth
No lifestyle change will override genetic hair loss on its own, but several habits support the treatments above and reduce unnecessary shedding. Protein is the raw material for hair, and diets very low in protein are a known trigger for telogen effluvium. Aim for adequate protein at each meal, especially if you’re on a calorie-restricted diet.
Chronic stress is another established trigger for shedding. It pushes follicles into the resting phase prematurely, and the hair loss typically shows up two to three months after the stressful period. Regular exercise, sleep, and stress management won’t regrow hair, but they reduce one of the most common accelerators of loss. Tight hairstyles that pull on the hairline (ponytails, braids, buns worn daily) can cause a form of hair loss called traction alopecia that becomes permanent if the pulling continues long enough. If your hairline is receding where your style pulls tightest, switching to a looser style can prevent further damage.