Before you can work out how to stop hair loss, you have to know which kind you have. The treatments that work brilliantly for one type do nothing for another, and the single most common reason people waste years and money is treating the wrong condition.
This guide covers the main types, the treatments with genuine clinical evidence behind them, and realistic timelines.
Step One: Identify the Type
Androgenetic Alopecia (Pattern Hair Loss)
The most common cause by a wide margin, affecting roughly 50% of men and 40% of women over a lifetime. Follicles sensitive to dihydrotestosterone (DHT) miniaturize over successive cycles, producing progressively finer, shorter hairs until they stop altogether.
Pattern: receding temples and crown thinning in men; a widening central part with preserved hairline in women.
Course: gradual, progressive, permanent without treatment.
Telogen Effluvium
Diffuse shedding two to four months after a physiological shock — illness, surgery, childbirth, crash dieting, bereavement, iron deficiency or thyroid disease. Usually fully reversible. See our detailed guide to stress-related hair loss.
Alopecia Areata
Autoimmune, producing smooth, round, well-defined bald patches. Needs dermatological treatment; corticosteroid injections and newer JAK inhibitors are effective for many patients.
Traction Alopecia
Caused by sustained tension from tight ponytails, braids, weaves and extensions. Reversible early, permanent once follicles scar. This is the most preventable form of hair loss there is.
Scarring (Cicatricial) Alopecia
Inflammation destroys the follicle and replaces it with scar tissue. Irreversible, and urgent — early treatment preserves what remains. Redness, scaling, pain or burning alongside loss means a dermatologist appointment this month, not next year.
Nutritional and Medical Causes
Iron deficiency, thyroid dysfunction, PCOS, rapid weight loss, protein deficiency and certain medications. All treatable once identified — which is why blood work comes first.
Step Two: Get the Blood Work
Ferritin, full blood count, full thyroid panel (TSH, free T4, and antibodies), vitamin D, B12, zinc, and for women with irregular cycles or acne, androgens. Ask for the actual numbers. “Normal” ferritin for general health is often well below the level hair needs.
Step Three: Treatments That Actually Work
Topical Minoxidil (2–5%)
The best-evidenced over-the-counter option, effective for both pattern loss and telogen effluvium. Prolongs the anagen phase and increases follicle size. Expect an initial shedding phase at weeks two to six — this is old hairs being pushed out by new growth and is a sign it is working. Give it four to six months, and understand that stopping reverses the gains.
Finasteride and Dutasteride (Prescription)
5-alpha-reductase inhibitors that block conversion of testosterone to DHT. Strong evidence in male pattern loss; used off-label in some post-menopausal women. Requires a doctor’s assessment of side-effect profile.
Spironolactone (Prescription, Women)
An anti-androgen frequently used for female pattern hair loss, particularly where PCOS is involved.
Low-Level Laser Therapy
FDA-cleared caps and combs with moderate evidence for pattern loss. Slow, expensive, but safe and a reasonable adjunct.
Platelet-Rich Plasma (PRP)
Injections of concentrated platelets into the scalp. Growing evidence for androgenetic alopecia; requires a series of sessions and maintenance.
Microneedling
Improves minoxidil absorption and appears to add benefit in combination. Best done professionally or with strict hygiene.
Rosemary Oil
One trial found 6-month results comparable to 2% minoxidil in androgenetic alopecia. Encouraging but a single small study — dilute in a carrier oil and patch test.
Hair Transplantation
FUE and FUT relocate DHT-resistant follicles from the back of the scalp. The only genuinely permanent restoration, best considered once loss has stabilized and usually alongside ongoing medical treatment.
Step Four: Protect What You Have
- No tight ponytails, braids, weaves or extensions at the hairline.
- Reduce heat and space out chemical services.
- Silk pillowcase; wide-tooth comb; gentle handling of wet hair.
- Treat scalp inflammation — see the dandruff guide.
- Adequate protein, iron and vitamin D — see how to grow hair faster and healthier.
- Do not crash diet during an active shedding phase.
What Does Not Work
- “Hair growth” shampoos with no active ingredient and seconds of contact time.
- Biotin megadoses in the absence of deficiency — and they interfere with thyroid and cardiac blood tests.
- Onion juice, garlic paste and similar folk treatments.
- Scalp-clogging oils applied to an inflamed scalp.
- Any product promising results in two weeks. The hair cycle does not permit it.
Realistic Timelines
- Months 0–2: possible increased shedding on minoxidil. Normal.
- Months 3–4: shedding slows; fine new hairs appear.
- Months 6–8: visible density improvement.
- Month 12: full assessment of whether a treatment is working.
Photograph the same area in the same light every month. Perception is unreliable; photographs are not.
When to See Someone
See a dermatologist for patchy loss, any redness, scaling, pain or burning, rapid loss, loss with other symptoms, or anything not improving after six months. A licensed stylist trained in scalp analysis can identify traction damage, distinguish breakage from shedding and flag patterns early — hair and scalp assessment is part of the core curriculum in our cosmetology program in Los Angeles.
Frequently Asked Questions
Can hair loss be reversed?
Telogen effluvium and early traction alopecia usually reverse fully. Pattern loss can be slowed and partly reversed with treatment. Scarring alopecia cannot be reversed.
How long does minoxidil take to work?
Four to six months for visible results, with an initial shedding phase in the first weeks. Benefits stop if you stop.
Is hair loss hereditary?
Androgenetic alopecia is strongly hereditary, inherited from both sides of the family, not only the maternal line.
Do hair loss shampoos work?
Only ketoconazole has modest supporting evidence, and mainly by reducing scalp inflammation. Most others do nothing.
When should I worry about hair loss?
Losing more than 100 hairs a day consistently, visible scalp, a widening part, patches, or any scalp pain, redness or scaling.
The Bottom Line
Identify the type, get blood work, start minoxidil for pattern loss, see a dermatologist for anything patchy or painful, and protect what you have from tension and heat. Give any treatment six months and photograph your progress. If hair science is a career you would like, talk to our admissions team.
