When a new baby is born, he or she has soft, fine and downy hair called lanugo that disappears shortly after the birth. Normally hair on the scalp and other parts of body becomes thicker and coarser. In middle age, hair growth can be seen on the ears of men and women develop the same on face at the time of menopause. This is due to change in endocrine pattern.
When the hair is under transition stage, which is from root to end, the hair is called ‘catagen’ hair. Catagen hair, begin transitional, live for about 7 to 15 days. During this transition phase, the growth activity of the hair stops. Growth of hair is not a continuous affair as some people think. Hair growing takes a resting phase during which no growth takes place and the roots of the resting hair become club-shaped. It is this condition that is called club hairs.
The stage when the growing is in process, the hair is called ‘Anagen’ hair. Anagen hair keeps on growing from two to five years. In Anagen hair, the cells of follicle grow, divide and are keratinized in order to make hair grow. Having keratin means that the base of the hair shaft is moist and soft and the rest of hair shaft above hair bulb is dark pigmented.
Catagen hair live for some time and when they are in the state of rest without any change, they are called ‘Telogen’ hair. Telogen hair are also called club hair. They are in the state of rest for three to four months before they grow or are pushed from follicle due to growth of another hair or due to some harsh combing/ brushing or hard massaging/continuous drying of hair by hot hair-blower or in fight etc. All these are mechanical reasons.
Growth of hair is fastest from the age of fifteen to late twenties. The hair grows faster and the rate of growth slows down when the hair have grown to its maximum. There is no limit to maximum but some doctors are of the opinion that this limit is three feel and when the hair are over three feet long, the growth rate drops to half the former growth rate.
The hair is affected by the state of the nervous system and circulatory system. This means that hair have a direct relation with functioning of the entire human organism, mind, sentiments, emotions and the body. Any such stimulation in the body by grief, emotions, etc. makes impact over the opulence of the nerve and blood supply to the head. If grief or emotions continue for some days, it affects the growth of hair.
Chemical and drug reactions also affect the growth of hair. The coloring of hair and dyeing of hair are virtually exposure to chemical reactions and many persons who dye or color their hair have retarded hair growth or encounter falling of hair.
The heredity/genes actually determine the hair density, growth and color of hair.
Hormonal change is one of the reasons for growth of hair.
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