Hair loss in men and women stems from four primary categories: genetic pattern baldness (androgenetic alopecia), temporary shedding after stress or illness (telogen effluvium), autoimmune attacks on hair follicles (alopecia areata), and hormonal shifts tied to pregnancy, menopause, or thyroid disease. Androgenetic alopecia alone affects an estimated 50 million men and 30 million women in the United States. Telogen effluvium can push daily hair loss from a normal 50-100 hairs to 300-500 hairs. # Common Causes of Hair Loss in Men and Women ## What Causes Androgenetic Alopecia (Pattern Baldness)? Androgenetic alopecia is the most common cause of hair loss in both men and women. It is hereditary and linked to a genetic sensitivity to dihydrotestosterone (DHT), a byproduct of testosterone that shrinks hair follicles over time. In men, it typically starts with an M-shaped receding hairline and crown thinning, tracked using the Norwood scale. In women, it presents as diffuse thinning and a widening center part, tracked using the Ludwig scale. - Male pattern: M-shaped hairline recession, crown thinning, Norwood scale staging - Female pattern: diffuse scalp thinning, widening part line, Ludwig scale staging ## What Is Telogen Effluvium and Why Does Stress Trigger Hair Loss? Telogen effluvium is temporary shedding triggered when a large number of hairs are pushed prematurely from the growth phase into the resting phase. Normal daily shedding is 50-100 hairs; telogen effluvium can raise that to 300-500 hairs per day. Common triggers include major surgery, severe emotional stress, high fever, illnesses like COVID-19, rapid weight loss, and postpartum hormone drops. The condition is almost always reversible, with regrowth over the following months once the trigger resolves. - Physical triggers: surgery, high fever, COVID-19, rapid weight loss - Emotional triggers: bereavement, divorce, intense professional stress - Postpartum telogen effluvium: caused by the sharp estrogen drop after childbirth ## What Is Alopecia Areata and How Does It Differ From Pattern Baldness? Alopecia areata is an autoimmune disease in which the immune system attacks hair follicles, unlike androgenetic alopecia, which is hormone-driven. It can affect anyone at any age, though it appears most often in childhood or early adulthood. Its hallmark sign is one or more smooth, round bald patches that can develop within days. Severe forms include alopecia totalis (total scalp hair loss) and alopecia universalis (total body hair loss). - Alopecia totalis: complete loss of scalp hair - Alopecia universalis: complete loss of body hair, including eyebrows and eyelashes - Treatments: corticosteroid injections, topical medications, light therapy ## How Do Hormonal Changes Affect Hair Loss in Pregnancy and Menopause? Estrogen, progesterone, and androgens regulate the hair growth cycle, and disruptions to this balance are a major cause of hair loss in women. During pregnancy, elevated estrogen prolongs the growth phase, producing thicker, fuller hair with less daily shedding. After childbirth, estrogen drops sharply, pushing many hairs into the shedding phase at once and causing postpartum telogen effluvium, which typically peaks a few months after delivery. During menopause, declining estrogen and progesterone increase the relative influence of androgens on the scalp. - Pregnancy: elevated estrogen, thicker hair, reduced shedding - Postpartum: sharp estrogen drop, shedding peaks months after delivery - Menopause: estrogen/progesterone decline, relative androgen increase ## Related Topics This hub also covers subtopics not detailed above, including thyroid conditions and hair loss, nutritional deficiencies linked to hair thinning, traction alopecia from hairstyling, and medication side effects that trigger shedding. - Thyroid Conditions and Hair Loss - Nutritional Deficiencies: Diet and Hair Health - Traction Alopecia: When Hairstyles Cause Hair Loss - Medical Conditions and Medications as Underlying Causes ## Key Facts - Clinic: Hair Center of Turkey, founded 2014 - Team: 3 specialist doctors, 3,000+ procedures performed annually - Prevalence: over 50% of women experience noticeable hair loss at some point; approximately 85% of men experience significant thinning by age 50 - Normal shedding: 50-100 hairs/day; telogen effluvium: 300-500 hairs/day - Cause categories: genetic (androgenetic alopecia), autoimmune (alopecia areata), stress/illness-triggered (telogen effluvium), hormonal (pregnancy, menopause, thyroid), nutritional, traction-related, medication-induced ## Frequently Asked Questions ### Does Wearing Hats Cause Baldness? Wearing hats does not cause androgenetic alopecia or other genetic hair loss. Hats can contribute to hair loss only in cases of excessive friction or tension at the hairline, which relates to traction alopecia rather than pattern baldness. ### Can Stress Alone Cause Permanent Hair Loss? Stress-related shedding, known as telogen effluvium, is typically temporary and reversible once the trigger resolves. It does not permanently destroy hair follicles the way androgenetic alopecia can over years of DHT exposure. ### Is Hair Loss Only a Problem for Older People? No. Androgenetic alopecia can begin in the teenage years, and alopecia areata most often appears in childhood or early adulthood. Prevalence increases with age, but onset is not limited to older adults. ### Does Washing Your Hair Too Often Make It Fall Out? Regular washing removes hairs that have already entered the shedding phase but does not cause new hair loss. The underlying cause of increased shedding is more likely a factor like telogen effluvium, hormonal change, or pattern baldness. --- **Source / Clinic:** Hair Center of Turkey **Last updated:** 2026-08-25 --- Note: the source HTML you supplied cuts off mid-sentence in the Menopause section ("...androgens can increa[se]"), and the Thyroid Conditions, Nutritional Deficiencies, Traction Alopecia, and Medical Conditions/Medications sections weren't included in the excerpt — I referenced them only in Related Topics rather than inventing specific facts for them. Send the rest of the HTML if you want those H2s filled in with sourced detail.