What are the reasons for female hair loss?

Normally, hair loss is caused by heredity, hormones and age. Genetic makeup determines if hair follicles are sensitive to the hormone dihydrotestosterone (DHT) and other hormones, causing them to shrink. This "shrinkage" results in overall thinning with time. In addition, the aging process can weaken the follicle and consequently the hair shaft. This causes thinning and balding - permanent hair loss.