This section is from the book "The Home Hand-Book of Domestic Hygiene and Rational Medicine. Volume 2.", by J. H. Kellogg, M.D.. Also available from Amazon: The Home Hand-Book of Domestic Hygiene and Rational Medicine, Volume 2.
There are two varieties of baldness, the ordinary form, and what is known as "patchy baldness," a form in which the hair is lost only in circumscribed spots. The loss of hair usually begins first at the temples, the forehead, or the crown, gradually extending. It is very common in old age, being the result of the general decline in nutrition which occurs in advanced life. When it occurs in early or middle life, it most commonly results from the disease of the scalp known as dandruff. Baldness also results from eczema and from ringworm and favus. Temporary baldness not infrequently follows erysipelatous, typhoid, and other fevers. Baldness may be occasioned by anything which deteriorates the general health. Excessive brain labor, resulting in congestion of the head and too much heat in the scalp, may produce it It may be the result of dyspepsia, of excesses of various kinds, and of any debilitating disease. Men suffer more than women, which is probably due to the fact that women do not so habitually overheat the head by the constant wearing of warm head coverings. In some cases, the disease is hereditary.