The Norwood Hamilton Scale is a way to measure the extent of male pattern baldness, and is the generally accepted standard when describing hair loss in general.

Norwood Scale – Stage 1

Very minor or no recession of the hairline, therefore no need for treatment. Unless you have a family history of baldness there is no need to worry. If there is a family history of male baldness, you may want to monitor the situation closely and decide the appropriate time for treatment.

Norwood Scale – Stage 2

Triangular and typically symmetrical areas of recession at the front temporal area. Hair loss remains ahead of a line several centimeters in front of the ears. Hair falls and may become less dense in the central front part of the scalp. Initial signs of baldness are becoming evident.

Norwood Scale – Stage 3

This represents the lowest extent of hair loss considered sufficient to be called baldness according to Norwood. Most scalps at this stage have deep symmetrical recession showing at the temples that are bare or only sparsely covered by hair. With stage 3 vertex, the crown is added since it is a common occurrence with age. Hair loss is primarily from the vertex with limited recession of the front temporal hairline.

Norwood Scale – Stage 4

Recession at the front temporal areas is more severe than stage 3. There is a decisive lack of hair on the crown. A band of moderately dense hair extending across the top separates the two areas of hair loss between front temporal and crown. This band bridges between the hairs covered areas on the side of the head.

Norwood Scale – Stage 5

At stage 5 hair loss at the vertex region is still separated from the front temporal region but the division is much less distinct. The band of hair extending across the crown is noticeably narrower and thinner. Hair loss at the vertex and front temporal regions are larger. When viewed from above, stages 5 to 7 show the remaining hair at the sides and back as a distinct horseshoe shape.

Norwood Scale – Stage 6

The bridge of hair that once crossed the crown is now been lost with only sparse hair remaining. The front temporal and vertex regions are now joined into one area. Hair loss on the sides has extended further.

Norwood Scale – Stage 7

This is the most advanced or severe form of hair loss. Only a narrow band of hair in a horseshoe shape survives on the sides and back of the scalp. This hair may be fine and less dense than before. At the nape of the neck the hair is sparse with a semi circle over both ears.


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