Hair defines much of our physical identity. But how does the scalp function? Why does hair fall out? What should you do if it's excessive? Who should you see? As dermatology experts with years of experience helping patients restore healthy hair, we'll provide clear, evidence-based answers.
Hair loss, in moderation, is entirely normal. The average person has about 120,000 hairs and loses roughly 100 per day. This doesn't noticeably thin your hair, given the density of around 200 hairs per cm². Each hair lives about 5 years, and follicles undergo 20 to 30 cycles before slowing. No need to worry prematurely!
Like living organisms, hair follows a distinct life cycle:
Key Insight: Far more hairs are growing than shedding at any time.
When shedding outpaces regrowth, it leads to alopecia, or thinning hair. This progressive loss often affects men more, starting at the forehead and crown.
Quick Test: Run your fingers through your hair like a comb. If 20+ hairs come out, it may signal excessive loss—consult a professional.
From temporary to chronic, here are the most common triggers, backed by clinical research:
Hair loss peaks in fall, much like in animals. Summer sun stimulates hormones, accelerating growth—and subsequent shed (2-4 times more).
Conditions like infections, thyroid disorders, or genetics/heredity can disrupt scalp health.
Crash diets lacking zinc, magnesium, calcium, or iron trigger alopecia. Vegetarians may notice more loss, as plant-based iron absorbs less efficiently than animal sources.
Mental health impacts the body, causing alopecia areata (patchy loss) or premature graying.
Follicles are sensitive to estrogen and progesterone. Pregnancy boosts them for thicker hair; postpartum drops cause shedding. Menopause similarly alters density and texture.
Surgical anesthetics can toxify roots temporarily, but hair typically regrows fully.
Follow these three proven rules: Avoid extreme heat (water or styling tools), shampoo every 2-3 days, and skip heavy products like hairspray.
Match shampoo and conditioner to your hair type (dry, oily, etc.). Rinse thoroughly to prevent weighing down or damaging strands. For mild loss, use targeted anti-shedding treatments.
Boost intake of sulfur amino acids (fish, meat, eggs, legumes, cereals) and trace minerals for stronger growth and reduced loss.
Identify the root cause first—hormonal vs. nutritional requires different approaches. Start with a dermatologist.
For severe cases, transplants offer lasting results, though costly. Discuss options with a specialist.
Mastered hair loss? Dive deeper into men's grooming with our guide on how to care for your beard.
