What causes 20 year old men to lose their hair?

Hair loss generally refers to hair loss. Men in their 20s hair loss may be related to physiological alopecia, scalp diseases, autoimmune diseases, etc.

1. Physiological alopecia

Human hair growth stage is divided into three stages, namely growth time, rest period, regression period. 85% of hair in the growth time, the body will break away from 70-100 roots of hair every day, is a normal phenomenon.

2. Scalp diseases

When the scalp is infected by fungi, bacteria caused by hair follicle inflammation, will destroy scalp hair follicles, causing hair loss, patients will also be accompanied by scalp itching, dandruff and other symptoms.

3. Autoimmune diseases

Hashimoto thyroiditis, alopecia areata and other diseases patients will appear hair loss due to autoimmune disorders.