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Androgens are male hormones that are present in both men and women, but are higher in men. Androgens do two things: First, they enlarge the sebaceous glands in the skin. Second, they cause these glands to increase oil production.Because hormones play a role in the production of sebum, one of the causes of greasy hair is fluctuating hormone levels. Greasy hair is most commonly found in teenagers going through puberty, in women because of their monthly cycle or pregnancy, and older women going through the menopause. Stress is also known to affect hormone levels and can therefore be a contributory factor towards greasy hair. People with fine hair often find that they suffer from excessive greasiness, as they have more hair and follicles meaning there are more glands on the scalp, each producing sebum.There are several external causes of greasy hair. Washing your hair too frequently can cause more sebum to be produced as frequent washing can strip the hair of oils, to combat this sebaceous glands excrete sebum. Sebaceous glands can be stimulated through vigorous scrubbing of the hair and scalp while washing.Scientists believe that the male hormone testosterone or more importantly dihydrotesterone is the cause behind hair loss. DHT is produced when the enzyme 5 alpha reductase combines with testosterone. This overabundance of DHT leads to follicles that produce weaker, shorter and thinner hair and eventually over time this will cause it to stop producing hair. This DHT imbalance leads to baldness (androgenetic alopecia).