Thinning hair occurs due to a combination of genetic, hormonal, and environmental factors that disrupt the hair growth cycle. The most common cause is androgenetic alopecia, which affects over 50% of men and women over age 50.
The hair growth cycle has three phases: anagen (growth), catagen (transition), and telogen (resting). Thinning happens when this cycle shortens, producing thinner, shorter hairs. Over time, follicles may shrink and stop producing new hair entirely.
Hair thinning stems from several key factors:
Many people assume thinning hair is solely genetic or inevitable with age. However, external factors like harsh hair treatments, tight hairstyles, or pollution also contribute. Unlike genetic thinning, these causes are often reversible with lifestyle changes.
Androgenetic alopecia, or pattern hair loss, develops when dihydrotestosterone (DHT) shrinks hair follicles. Men typically see a receding hairline, while women experience thinning. Treatments like minoxidil or finasteride can slow progression.
I once consulted a dermatologist about my mother's thinning hair. Testing revealed low thyroid levels, which, when treated, improved her hair density within six months. This underscores the importance of medical evaluation.
Consult a doctor if thinning occurs suddenly, in patches, or with other symptoms like itching or redness. Early intervention improves outcomes. Options include medications, therapies, or procedures like hair transplants.