Androgenic Alopecia


One of the most common types of hair loss in men, androgenic alopecia - is also known as male pattern baldness. The condition affects nearly two thirds of all men after the age of forty though it is not unusual for symptoms to first occur at an earlier age.

The exact cause of male pattern baldness is still not fully understood. That the condition is related to genetics and an imbalance of sex hormones is undeniable though. If you have family members with the same pattern of hair loss, it is highly likely that you will experience the same type of baldness. High levels of male sex hormones also result in the damage of hair follicles that lead to thinning of the hair and ultimately baldness. 
References
  1. http://www.nlm.nih.gov/medlineplus/ency/article/001177.htm
  2. http://www.ncbi.nlm.nih.gov/pubmedhealth/PMH0002156/