Curious about the rate at which hair grows? Whether you're recovering from a bad haircut, dealing with hair loss, or aiming for longer locks without breaking the bank, understanding hair growth is key. Board-certified dermatologist Dr. Hadley King shares insights on the truths and myths surrounding hair growth.
On average, hair grows about half an inch per month or 6 inches per year, according to Dr. King and the American Academy of Dermatology Association (AAD).
The hair growth cycle comprises three stages: anagen (growth period), catagen (transition period), and telogen (rest period). The anagen phase lasts three to five years, during which a hair strand can grow anywhere from 18 to 30 inches. The catagen phase is brief, lasting about 10 days, followed by the telogen phase where strands are shed.
Dr. King notes that shedding 50 to 100 hairs per day is normal. After the cycle completes, the hair follicle remains active for about three months before restarting the process.
Treatments to enhance hair growth focus on prolonging the anagen phase rather than speeding up growth. Factors like stress, poor nutrition, weight loss, surgery, childbirth, or illness can lead to conditions like telogen effluvium, causing hair to thin.
While Rogaine and other medications can aid in early hair loss, they may not restore a full head of hair. Additional treatments like microneedling and laser therapy show potential but require more research for confirmation.
If experiencing hair loss, experts recommend determining the underlying cause. Androgenetic alopecia is the leading cause of hair loss in men, while women face a variety of potential factors. Seeking guidance from a medical professional is crucial before attempting any at-home treatments.
Contrary to popular belief, trimming hair does not accelerate growth. However, regular trims help maintain healthy hair by removing damaged ends, reducing breakage without impacting growth speed.