Hair Loss

Classification

Scalp of a normal adult contains around 1 million hairs. By the middle age you lose about 30% of your hair. For hair thinning to become noticeable, at least 50% of the hairs must have fallen out in that particular area. In addition to the loss of the number of hairs, the thinning of hair also make that area look bald.

The most widely accepted classification system for androgenic alopecia is the Norwood Classification System. This classification recognizes and categorizes the typical sequence of the hair loss process in men in seven stages. In early stages, the hairline recedes, typically led by fronto-temporal recessions. In the latter stages (types 4-7), progression of hair loss at the vertex (crown) gradually meets and joins the progressive hairline recession, resulting in varying shapes & sizes (in both coronal and sagittal dimensions) of the confluent vertex with fronto-temporal regions of baldness.

In women, the development of androgenic alopecia is classified into three stages. The typical pattern of hair loss in women is progressive diffuse thinning of an oval area over the top of the scalp. Hair loss along the hairline is usually spared.
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