Treating hair loss in women starts with identifying the type of hair loss you’re dealing with, because the right approach depends entirely on the cause. The two most common types are female pattern hair loss, a gradual thinning driven by genetics and hormones, and telogen effluvium, a temporary but sometimes alarming shed triggered by stress, illness, or nutritional gaps. Both are treatable, and most women see meaningful improvement once they match the right strategy to their specific situation.
Figure Out What’s Causing It First
Female pattern hair loss shows up as a widening part line or overall thinning across the top of the scalp, usually sparing the hairline. It develops slowly over months or years. Telogen effluvium, by contrast, comes on suddenly. You notice clumps in the shower drain or on your pillow, often two to three months after a triggering event: a high fever, major surgery, childbirth, crash dieting, severe emotional stress, or starting or stopping certain medications like birth control pills.
A less common but important category is scarring alopecia, where inflammation permanently destroys hair follicles. Signs include redness, scaling, or pain at the scalp, and the affected patches may look smooth and shiny. If a dermatologist suspects scarring alopecia, a scalp biopsy can distinguish it from other types. The biopsy looks for specific changes: in female pattern hair loss, follicles shrink but remain intact, while in scarring conditions like lichen planopilaris or discoid lupus, the follicles are replaced by scar tissue and the oil glands disappear entirely. This distinction matters because scarring types require aggressive treatment to prevent permanent loss.
Blood work isn’t always necessary for straightforward pattern hair loss, but it becomes important if there are signs of hormonal imbalance (acne, irregular periods, facial hair growth) or if your doctor suspects a nutritional deficiency. The most commonly checked levels include thyroid function, iron stores (ferritin), and sometimes androgen hormones.
Check Your Iron and Nutrition
Iron deficiency is one of the most overlooked and correctable contributors to hair loss in women. The tricky part is that standard lab reference ranges for ferritin (the protein that stores iron) set the “normal” floor as low as 10 or 15 ng/mL, but multiple lines of evidence now suggest the body’s true physiological cutoff is closer to 50 ng/mL. Below that level, women commonly experience fatigue, impaired cognition, and hair thinning, even if their blood counts look perfectly normal. Studies using sensitive biomarkers of iron depletion confirm that the body’s compensatory mechanisms for low iron don’t fully normalize until ferritin exceeds 50 ng/mL.
Some hair loss researchers have found that anti-hair-loss treatments work better in women whose ferritin is above 40 ng/mL. If your levels are below that range and you’re actively losing hair, iron supplementation is worth discussing with your doctor. Protein intake also matters: crash diets and very low protein diets are well-established triggers for telogen effluvium.
Topical Minoxidil: The First-Line Treatment
Minoxidil is the most widely used and best-studied topical treatment for female pattern hair loss. It works by extending the growth phase of the hair cycle and increasing blood flow to the follicle. Two strengths are available: 2% solution (applied twice daily) and 5% foam (applied once daily). In a phase III trial of 322 women, the 5% foam used once a day produced virtually identical hair regrowth to the 2% solution used twice daily, with both groups gaining roughly 24 additional hairs per square centimeter over 24 weeks. The 5% foam also caused less skin irritation and was easier to work into a daily routine, making it the preferred option for most women.
One thing to prepare for: a temporary increase in shedding, commonly called “dread shed,” typically starts two to four weeks after you begin treatment and lasts three to six weeks. This happens because minoxidil pushes resting hairs out to make way for new growth. It’s a sign the treatment is working, not failing, but it can be alarming if you aren’t expecting it. Results generally become visible around four to six months in, and you need to continue using minoxidil to maintain the gains.
Oral Medications for Hormonal Hair Loss
For women whose hair loss has a hormonal component, spironolactone is the most commonly prescribed oral option. Originally developed as a blood pressure medication, it blocks the effects of androgens (male-type hormones) on hair follicles. Typical doses range from 25 to 200 mg daily, with 100 mg being the most common starting point. A systematic review and meta-analysis found that about 57% of women treated with spironolactone experienced improved hair loss. It’s not a quick fix: most dermatologists recommend at least six to twelve months before judging whether it’s working.
Spironolactone is not safe during pregnancy because of its anti-androgen effects, so reliable contraception is required while taking it. Side effects can include breast tenderness, irregular periods, lightheadedness, and increased urination. Low-dose oral minoxidil is another option some dermatologists now prescribe, though it carries its own set of considerations including potential for body hair growth.
PRP Therapy: What the Injections Involve
Platelet-rich plasma (PRP) therapy involves drawing a small amount of your blood, spinning it to concentrate the growth-factor-rich plasma, and injecting it into the thinning areas of your scalp. A meta-analysis of 17 randomized controlled trials found a substantial increase in hair density in PRP-treated groups compared to controls. Most studies followed a monthly treatment schedule, with follow-up periods of six months or less, meaning you’re typically looking at four to six initial sessions spaced about a month apart.
PRP is not covered by insurance and costs can range from a few hundred to over a thousand dollars per session. It’s often used alongside minoxidil or other treatments rather than as a standalone therapy. Some discomfort during the injections is normal, though numbing cream or local anesthesia is usually applied beforehand.
Red Light Therapy Devices
Low-level laser therapy (also called red light therapy) uses specific wavelengths of light to stimulate hair follicles. Most devices cleared by the FDA for home use operate at around 650 to 660 nanometers (red light), and clinical studies have tested a range of protocols: from 10 to 25 minutes per session, used daily or every other day, over 14 to 26 weeks. One trial using a laser helmet every other day for 16 weeks reported a 35% increase in hair growth among participants.
Several FDA-cleared consumer devices are currently available, including the iRestore Essential cap, the Capillus PRO hat, the Theradome PRO helmet, and the HigherDOSE hat. These range in price from around $300 to over $1,000. The convenience of at-home use is appealing, but the evidence is stronger for mild to moderate thinning than for advanced loss. Red light therapy works best as a complement to other treatments rather than a replacement.
Telogen Effluvium: The Shedding That Fixes Itself
If your hair loss came on suddenly after a major physical or emotional stressor, telogen effluvium is the most likely explanation. The hair doesn’t actually start falling out until one to six months after the triggering event (three months on average), which often makes it hard to connect the shedding to its cause. Common triggers include childbirth, high fevers, severe infections including COVID-19, major surgery, significant weight loss, stopping birth control, thyroid problems, and iron deficiency.
The good news is that acute telogen effluvium resolves on its own once the trigger is removed. The challenging part is patience: hair growth may take up to six months to restart, and it can take a full year before your hair feels like it’s back to its previous density. In the meantime, addressing any underlying nutritional deficiencies (especially iron and protein), managing stress, and being gentle with your hair during styling can help. Chronic telogen effluvium, where shedding persists beyond six months without an obvious ongoing trigger, does exist but still carries a generally favorable outcome over time.
What a Realistic Timeline Looks Like
Hair grows about half an inch per month, and most treatments need time to shift follicles from their resting phase back into active growth. With minoxidil, most women notice reduced shedding within two to three months and visible new growth by four to six months. Spironolactone typically requires six to twelve months. PRP results tend to show up around three to six months after the initial series of treatments. Red light devices follow a similar timeline of three to six months for noticeable changes.
Combining treatments often produces better results than any single approach. A common combination is topical minoxidil with spironolactone, or minoxidil with PRP or red light therapy. Your dermatologist can help you layer treatments based on the severity and type of your hair loss, your tolerance for side effects, and your budget. The earlier you start treatment, the more hair you have to work with, so acting on thinning sooner rather than later gives you the best possible outcome.