Norwood scale for male pattern baldness Norwood Scale

The Hamilton-Norwood scale is a way of measuring male pattern baldness. It was introduced by Dr. James Hamilton in the 1950s and later revised and updated by Dr. O'Tar Norwood in the 1970s.
There are 2 main types of balding, anterior (front) and vertex (back), as this alternate view of the Norwood scale shows a bit more clearly.
This chart of hair loss pictures is a useful tool for diagnosis (and to avoid misdiagnosis) and for describing the extent of hair loss for treatment  purposes.

 

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There are seven levels of loss in the Norwood scale:

Norwood 1
Normal head of hair with no visible hair loss.

Norwood 2
The hair is receding in a wedge-shaped pattern.

Norwood 3
Same receding pattern as Norwood 2, except the hairline has receded deeper into the frontal area and the temporal area.

Norwood 4
Hairline has receded more dramatically in the frontal region and temporal area than Norwood 3 and there is the beginnings of a bald spot at the back of the head.

Norwood 5
Same pattern as Norwood 4 but much reduced hair density.

Norwood 6
The strip of hair connecting the two sides of the head that existed in Norwood 4 and 5 no longer exists in Norwood 6.

Norwood 7
Norwood 7 shows hair receding all the way back to the base of the head and the sides just above the ears.