Chronic Telogen is a disorder of the scalp which is manifested by heavy hair loss during the last stage of hair, the telogen stage, from which it gets its name. Chronic telogen is caused by fever, childbirth, chronic illness, anemia, eating disorders, major surgery, hypothyroidism, emotional disorders, crash diets and drugs. There are several causes for this condition both physical and psychological.
Diagnosis for this condition is done by a test know as a trichogram. In order to understand the process of chronic telogen, it is required to understand the hair growth cycle. This is described below:
There is no continuous growth of hair on the human scalp. The anagen phase of growth lasts for 3 to 7 years. The catagen phase is a transition phase when there is a regression following the involution of hair follicles. This is followed by the telogen phase which is a short period of about 100 days.
During this period, there is no hair growth. The end of the telogen phase is characterized with shedding of hair. Normally, the hair is shed and then begins a new cycle of growth. If this does not occur but the hair shedding in the telogen phase is excessive (well over 100 hairs per day), then it is known as chronic telogen.
For switching large numbers of hair follicles from the anagen phase to the telogen phase, there should be some kind of systemic insult inflicted on the body. Chronic telogen does not occur as a result of topical medications. However, some common factors have been observed and they are as follows: