Types of Hairloss
Male Pattern Baldness
Male Pattern Baldness is both genetic and associated with the male sex hormones called androgens. Androgens have many functions, one of which is to regulate hair growth.
Normally, an individual strand of hair grows for two to six years, goes through a resting stage for several months, falls out, and is replaced by a new hair strand. With male pattern baldness, the hair follicle becomes smaller. It grows shorter and finer strands, and eventually stops growing hair altogether.
There are a number of reasons why men start to go bald, but if you are a man between the ages of about 20 to 45 and you start to lose scalp hair, then the chances are 95% certain that you are experiencing male pattern baldness. As the term suggests, male pattern baldness follows a typical sequence or pattern. Hair loss can start in different areas but is usually at the temples and/or on the crown of the head. Initial thinning of hair progresses over a number of years and may lead to total baldness but more typically loss of hair over the top surface of the head.
Classification of Hair Loss in Men
The Norwood classification, published in 1975 by Dr. O’tar Norwood, is the most widely used classification for hair loss in men. It defines two major patterns and several less common types. In the regular Norwood pattern, two areas of hair loss—a front recession and thinning crown—gradually enlarge and coalesce (merge) until the entire front, top and crown (vertex) of the scalp are bald.
- Class I represents an adolescent or juvenile hairline and is not actually balding. The adolescent hairline generally rests on the upper brow crease.
- Class II is the earliest stage of male hair loss. It is characterized by a deepening temporal recession.
- Class III Vertex represents early hair loss in the crown (vertex).
- Class IV is characterized by further frontal hair loss and enlargement of vertex, but there is still a solid band of hair across the top (mid-scalp) separating front and vertex.