Hair growth is caused by several factors: hormonal changes at different stages of the life cycle such as teenage years, pregnancy and menopause. Other causes are genetic such as heredity, or reactions to medication as well as hormonal and glandular imbalances such as Polycystic Ovarian Syndrome (PCOS).

It is caused by genetics attributed to the mother or father; and hormones, specifically testosterone and dihydrotestosterone (DHT). See similar questions...

Some women have genetically determined hair loss or hair loss from a series of medical conditions or genetic inheritance. Others may experience hair loss from surgery, or injury. Still others experience hair loss from wearing very tight hairstyles that exert constant pull on the hair. Because some hair loss in women can be caused by underlying medical conditions, it is important that women with undiagnosed hair loss be evaluated by their own physicians. See similar questions...

Note: Once hair changes from the light vellus (fine hair) stage to the dark terminal stage, the color and texture will remain in that condition even after the cause of the change has been diagnosed. See similar questions...

According to current medical science, excessive hair growth is primarily caused by three factors: Normal Systemic Changes, Heredity and Glandular Disturbances. Normal Systemic Changes can be caused by puberty, pregnancy, menopause and hysterectomy. Puberty stimulates change in both the body and hair-growth patterns. Common pattern changes include an increase in hair follicle activity and an overall darkening/thickening of the hair shaft. See similar questions...

There are many factors that can contribute to unwanted or superfluous hair growth. These factors include: heredity, normal psychological changes (puberty, pregnancy, and menopause can cause hormonal imbalances, which can result in unwanted hair growth), endocrine system changes, medication, and stress. Stress can be a major contributing factor to hair growth. See similar questions...

There are three main categories to describe the origin of superfluous or unwanted hair. They are congenital growth, topical growth and systemic growth. Congenital growth refers to inherited hair growth patterns. For example, women of Italian or Mediterranean descent can exhibit superrfluous facial hair, which is normal, but can be undesirable socially. Topical growth refers to situations involving tweezing or waxing, or cases involving injuries, casts, scar tissues, etc. See similar questions...

Superfluous hair is a condition that may affect as many as 80 percent of all women and men to some degree. Usually, it can be traced either to heredity or to some type of glandular/ endocrine hormone imbalance. Puberty, pregnancy, and menopause create changes which may cause hairs to become noticeably thicker, coarser, and darker. Illness, certain medications, hormones, and stress can also trigger dramatic increases in hair growth. See similar questions...