Hair Loss in Men —
Causes, Stages & When to Act

The 7 main causes of male hair loss

Hair loss in men is not a single condition. It has multiple causes, and the correct treatment depends entirely on identifying which type you have.

1. Androgenetic alopecia (male pattern baldness)

The most common cause — responsible for approximately 95% of male hair loss. Androgenetic alopecia is caused by the hormone dihydrotestosterone (DHT), which binds to hair follicle receptors and progressively miniaturises them. The follicles produce thinner, shorter hairs until they stop producing hair entirely. The pattern follows the Norwood-Hamilton scale, typically beginning at the temples and crown.

Androgenetic alopecia is genetic — inherited from either parent. If your father, maternal grandfather or uncles experienced significant hair loss, your risk is elevated.

2. Telogen effluvium

A diffuse, temporary shedding triggered by physiological stress — illness, surgery, crash dieting, significant weight loss, or severe emotional stress. Hair enters the resting (telogen) phase prematurely and sheds 2–3 months after the trigger event. Unlike androgenetic alopecia, telogen effluvium is typically reversible once the underlying cause is resolved.

3. Alopecia areata

An autoimmune condition in which the immune system attacks hair follicles, causing patchy hair loss. In some cases it progresses to alopecia totalis (complete scalp loss) or alopecia universalis (loss of all body hair). Alopecia areata requires dermatological assessment before any hair restoration treatment.

4. Traction alopecia

Caused by repeated mechanical tension on the hair — tight hairstyles, dreadlocks, extensions or helmets worn daily. If caught early, traction alopecia is reversible. If the follicles are permanently damaged, hair restoration surgery may be indicated.

5. Nutritional deficiencies

Iron deficiency (ferritin below 30 ng/mL), vitamin D deficiency, zinc deficiency and protein insufficiency can all contribute to diffuse hair shedding. A blood panel is advisable before pursuing surgical options — deficiencies should be corrected first.

6. Medications

A number of common medications list hair loss as a side effect: beta-blockers, statins, anticoagulants, antidepressants, retinoids, gout medications (allopurinol) and anabolic steroids. If you started a medication in the months before hair loss began, discuss alternatives with your prescribing doctor.

7. Thyroid dysfunction

Both hypothyroidism and hyperthyroidism can cause diffuse hair thinning. A thyroid panel (TSH, T3, T4) should be included in any blood workup for unexplained hair loss.

The Norwood scale — understanding your hair loss stage

The Norwood-Hamilton scale is the standard classification system for male pattern hair loss. It runs from Stage I (no significant loss) to Stage VII (extensive loss).

Stage determines both your candidacy for surgery and the number of grafts required. Donor density — the number of follicles available at the back and sides of the scalp — is equally important and varies between individuals.

The Norwood stage tells you where you are today. The question a good surgeon asks is: where will you be in 10 years? That is what determines the hairline we design. — Dr. Arslan Musbeh

Treatment options — what works at each stage

Effective treatment depends on your hair loss cause, stage and goals. Below is a clinical overview.

Non-surgical options

Minoxidil (Rogaine): A topical vasodilator that prolongs the anagen (growth) phase. Effective in approximately 50% of users for slowing or stopping loss. Must be applied indefinitely — cessation leads to resumption of loss. Available OTC in 2% and 5% concentrations. The 5% formulation is more effective but may cause initial shedding.

Finasteride (Propecia): An oral 5-alpha-reductase inhibitor that blocks DHT conversion. Clinical trials show 83% of men maintain hair density; 66% see visible regrowth. Side effects (sexual dysfunction, mood changes) occur in approximately 2–3% of users. Not recommended under age 25 or in men planning to father children.

PRP (Platelet-Rich Plasma): A concentration of growth factors from your own blood injected into the scalp. Evidence supports PRP as a complement to other treatments, particularly in early-stage alopecia. At Hairmedico, PRP is included in all surgical packages as a post-operative recovery protocol.

Surgical option — FUE hair transplant

Hair transplant surgery is the only permanent solution for androgenetic alopecia. Individual follicular units are extracted from the permanent donor zone at the back and sides of the scalp — areas genetically resistant to DHT — and transplanted to thinning or bald areas.

The transplanted follicles retain their genetic resistance to DHT in their new location. They will not fall out from pattern baldness. This is why a well-planned hair transplant produces permanent results — provided the surgeon designs the hairline to account for future progressive loss.

Candidacy for surgery depends on: adequate donor density, stabilised hair loss (or medical management of active loss), realistic expectations and good general health. Most men become surgical candidates between Norwood II and VI.

When is the right time for a hair transplant?

The most common mistake is acting too early. Hair loss must be sufficiently stabilised before surgery — otherwise the transplanted hairline can look unnatural as native hair behind it continues to thin.

General guidelines:

• Age 25 or older — earlier cases should be assessed individually
• Hair loss stable for at least 12 months, or actively managed with minoxidil or finasteride
• Norwood II or higher with adequate donor zone
• Realistic expectations about results and timeline (12–14 months for full result)

Men in their early 20s with aggressive loss are advised to stabilise medically first. A thorough consultation — reviewing your family history, progression pattern and scalp photographs — will determine the appropriate timing for your case.

Common questions

Related articles

References & sources

1. 1.Cranwell W, Sinclair R. Male Androgenetic Alopecia. Endotext — NCBI Bookshelf. 2023. https://www.ncbi.nlm.nih.gov/books/NBK278957/
2. 2.Piraccini BM, Alessandrini A. Androgenetic alopecia. Giornale Italiano di Dermatologia e Venereologia. 2014. https://pubmed.ncbi.nlm.nih.gov/24566575/
3. 3.Gupta AK et al. Minoxidil: a comprehensive review. Journal of Dermatological Treatment. 2022. https://doi.org/10.1080/09546634.2020.1807246
4. 4.Norwood OT. Male pattern baldness: classification and incidence. Southern Medical Journal. 1975. https://doi.org/10.1097/00007611-197511000-00009
5. 5.Hamilton JB. Patterned loss of hair in man: types and incidence. Annals of the New York Academy of Sciences. 1951. https://doi.org/10.1111/j.1749-6632.1951.tb27729.x
6. 6.Sinclair R. Male pattern androgenetic alopecia. BMJ. 1998. https://doi.org/10.1136/bmj.317.7162.865

All references are peer-reviewed medical literature or official health authority publications. No commercial sources included.