Hair is an important part of our body. Healthy hair enhances beauty of the body. People may not be aware that the visible hair called hair shaft or cuticle is non-living part and the living part lies under the skin. To ensure healthy hair production scalp skin must be kept healthy. There are glands in the human skin called sebaceous glands that produce an oily substance called sebum. This sebum protects hair and skin from micro organisms as it inhibits the growth of microorganisms on the skins. This oily substance give moisture and shine to the hairs and is distributed mechanically by brushing and combing. Brushing the scalp also stimulates the sebaceous glands which in turn produce more sebum. Washing of hairs removes excess of sweat and oil. There are various body conditions which influence the growth, color and texture of hairs. Hair may be affected by diseases of various systemic diseases as well as local conditions of the scalp. Diseases like hypothyroidism, hypopitutarism, diseases of supra renal glands, liver disorders and anemia have their influence on hairs. Few drugs and therapies like chemotherapy and radiotherapy which are used in cancer management are related to hair problems.  

Hair loss and thinning of hair is a very common problem. This condition is caused by various scalp conditions like fungal infection, alopecia. Some systemic diseases like iron deficiency, pregnancy, lactation, excessive male hormones and few drugs. When pregnancy or lactation causes hair loss then it returns to normal in three to four months. Therefore a detailed physical examination and laboratory tests can confirm the cause of hair loss.