What Causes Hair Loss in Men - UK Pharmacy Guide

Understanding what causes hair loss in men is the first step toward effective treatment. Male pattern baldness, or androgenetic alopecia, affects over half of men by age 50 and is driven primarily by genetic predisposition and hormonal factors, particularly sensitivity to dihydrotestosterone (DHT)[1]. At Cured Pharmacy, our UK-registered clinical team helps men access evidence-based treatments after a free online consultation, with transparent pricing and 20% off your first order using code Hairlossnew.

The Primary Hormonal Factor in What Causes Hair Loss in Men

The single most important factor in what causes hair loss in men is dihydrotestosterone (DHT), a potent androgen derived from testosterone via the enzyme 5-alpha-reductase[1]. Men with androgenetic alopecia inherit hair follicles that are genetically sensitive to DHT; when DHT binds to receptors in these follicles, it triggers a process called miniaturisation—the follicle shrinks, the growth phase shortens, and eventually the hair becomes so fine it appears invisible.

This hormonal mechanism explains why treatments that lower DHT levels or block its action at the follicle—such as finasteride 1mg—can slow or halt progression in many men[2]. Importantly, DHT sensitivity is inherited; if your father or maternal grandfather experienced pattern baldness, your risk is significantly elevated. The process typically begins at the temples and crown, following a predictable pattern classified by the Norwood-Hamilton scale.

• DHT binds to androgen receptors in genetically susceptible hair follicles
• Follicle miniaturisation shortens the anagen (growth) phase over successive cycles
• Inherited sensitivity determines pattern and progression of hair loss
• Treatments targeting DHT can interrupt this cycle in many men

Genetic and Age-Related Factors Behind What Causes Hair Loss in Men

Genetics account for approximately 80% of what causes hair loss in men, with multiple genes involved—not a single 'baldness gene'[1]. These genes influence androgen receptor sensitivity, 5-alpha-reductase activity, and the follicle's response to DHT. While the condition can begin in the late teens or early twenties, prevalence increases steadily with age: roughly 30% of men by age 30, 50% by age 50, and over 70% by age 70.

Age compounds genetic predisposition because cumulative DHT exposure gradually exhausts the follicle's regenerative capacity. Even men without a strong family history may experience some degree of thinning as they age, though the pattern and severity vary widely. Understanding your genetic risk helps set realistic expectations for treatment outcomes and timing.

Other Contributing Factors

While DHT and genetics dominate what causes hair loss in men, secondary factors can accelerate or unmask the process. Chronic stress, nutritional deficiencies (iron, zinc, vitamin D), certain medications (beta-blockers, anticoagulants), and underlying medical conditions (thyroid disorders, autoimmune disease) may contribute[3]. These causes are less common than androgenetic alopecia but should be ruled out, especially if hair loss is sudden, patchy, or accompanied by other symptoms. A UK prescriber will review your medical history during consultation to identify any secondary triggers.

How Understanding What Causes Hair Loss in Men Guides Treatment Choice

Knowing that DHT-driven follicle miniaturisation is central to what causes hair loss in men allows targeted intervention. Finasteride 1mg (including branded Propecia) inhibits type II 5-alpha-reductase, reducing scalp DHT by approximately 60–70% and halting progression in around 90% of men in clinical trials, with visible regrowth in up to 66% over two years[2]. Because it addresses the hormonal cause, finasteride is considered the gold-standard oral treatment for male pattern baldness.

Topical minoxidil 5% (Regaine Extra Strength Foam) works differently—it is thought to prolong the anagen phase and improve blood flow to follicles, independent of DHT. Combining both mechanisms (as in our Hair Loss Combo Pack) can produce additive benefits. Dutasteride 0.5mg inhibits both type I and type II 5-alpha-reductase, lowering DHT further than finasteride, but is used off-label for hair loss in the UK at the prescriber's discretion[4]. All prescription treatments require clinical assessment by a UK-registered prescriber and must be continued to maintain benefit.

1. Identify whether your hair loss pattern matches androgenetic alopecia
2. Complete a free online consultation with our UK clinical team
3. Receive a personalised treatment recommendation based on your medical history
4. Start treatment early for best results—once follicles are dormant, regrowth is unlikely
5. Commit to consistent use for at least 3–6 months to assess response

Hair Loss Treatments at Cured Pharmacy – Compare Your Options

Clinical Evidence on What Causes Hair Loss in Men and Treatment Efficacy

Large-scale trials have clarified both what causes hair loss in men and how effectively we can intervene. The landmark finasteride 1mg studies enrolled over 1,800 men aged 18–41 with mild to moderate vertex hair loss; after 24 months, 66% showed visible regrowth versus 7% on placebo, and 83% maintained or increased hair count[2]. These results underscore that blocking DHT can reverse miniaturisation in many follicles if treatment begins before they are completely dormant.

For minoxidil 5% foam, a 48-week trial demonstrated significantly greater hair count increases compared with 2% solution, with earlier visible improvement[5]. Dutasteride trials in men with androgenetic alopecia showed superior hair count gains versus finasteride, though it remains off-label for this indication in the UK[4]. Importantly, no treatment guarantees regrowth, and individual response varies; realistic expectations and adherence are essential. Our superintendent pharmacist, Tarun Kumar (GPhC 2233073), and clinical team ensure every patient understands both the evidence and limitations before starting therapy.

Why Choose Cured Pharmacy for What Causes Hair Loss in Men

At Cured Pharmacy (GPhC 9012511), we combine clinical expertise with transparent, patient-centred service. Our free online consultation takes under three minutes, and prices are shown upfront—generic finasteride 1mg starts from £12.49 for 28 tablets, with no hidden fees. We supply only UK-licensed, genuine medicines, and every prescription is reviewed by a UK-registered prescriber who understands what causes hair loss in men and tailors treatment accordingly.

We offer next-day discreet delivery, and new patients save 20% on their first order with code Hairlossnew. Whether you choose finasteride, the Hair Loss Combo Pack, or another option, you will receive ongoing support and clear guidance on what to expect. Male pattern baldness is a chronic condition, but with early, evidence-based intervention, most men can slow progression and many will see meaningful regrowth.

• UK-registered pharmacy and clinical team (GPhC 9012511)
• Transparent pricing with no consultation fees—finasteride from £12.49
• Free online assessment under 3 minutes, reviewed by UK prescribers
• Genuine UK-licensed medicines with next-day discreet delivery
• 20% off your first order with code Hairlossnew

Scientific references

1. Cranwell, W., & Sinclair, R. (2016). Male androgenetic alopecia. In Endotext [Internet]. MDText.com, Inc. https://www.ncbi.nlm.nih.gov/books/NBK278957/ [accessed 28 October 2026]
2. Kaufman, K. D., Olsen, E. A., Whiting, D., Savin, R., DeVillez, R., Bergfeld, W., ... & Hordinsky, M. (1998). Finasteride in the treatment of men with androgenetic alopecia. Journal of the American Academy of Dermatology, 39(4), 578–589. https://doi.org/10.1016/s0190-9622(98)70007-6 [accessed 28 October 2026]
3. Phillips, T. G., Slomiany, W. P., & Allison, R. (2017). Hair loss: Common causes and treatment. American Family Physician, 96(6), 371–378. https://www.aafp.org/pubs/afp/issues/2017/0915/p371.html [accessed 28 October 2026]
4. Gupta, A. K., & Charrette, A. (2014). The efficacy and safety of 5α-reductase inhibitors in androgenetic alopecia: A network meta-analysis and benefit–risk assessment of finasteride and dutasteride. Journal of Dermatological Treatment, 25(2), 156–161. https://doi.org/10.3109/09546634.2013.813011 [accessed 28 October 2026]
5. Olsen, E. A., Dunlap, F. E., Funicella, T., Koperski, J. A., Swinehart, J. M., Tschen, E. H., & Trancik, R. J. (2002). A randomized clinical trial of 5% topical minoxidil versus 2% topical minoxidil and placebo in the treatment of androgenetic alopecia in men. Journal of the American Academy of Dermatology, 47(3), 377–385. https://doi.org/10.1067/mjd.2002.124088 [accessed 28 October 2026]
6. Medicines and Healthcare products Regulatory Agency. (2017). Finasteride 1 mg for male pattern hair loss: MHRA safety review. GOV.UK. https://www.gov.uk/drug-safety-update/finasteride-1-mg-for-male-pattern-hair-loss-mhra-safety-review [accessed 28 October 2026]
7. NHS. (2026). Hair loss. https://www.nhs.uk/conditions/hair-loss/ [accessed 28 October 2026]
8. NHS. (2026). Finasteride: a medicine to treat an enlarged prostate and male pattern baldness. https://www.nhs.uk/medicines/finasteride/ [accessed 28 October 2026]