Hair loss is extremely common. Half of the population has alopecia by the age of 50 years. Men and women are affected in equal proportion. Alopecia can have a significant impact on patients’ quality of life and on psychological well being.
There are several types of alopecia, which can be classified by underlying pathological mechanisms and the possibility of hair regrowth. The former can guide possible therapeutic options.
Here are different alopecia types explained: http://www.gponline.com/diagnosis-common-hair-lossconditions/ dermatology/article/1447781