Although hair loss caused by Vitamin B deficiency is not that common, it can still be an important factor. This vitamin mostly produces energy from red blood cells in the body and helps regulate your nervous system.
10. Autoimmune disease
An overactive immune system can easily create confusion in the body. Suddenly, it sees the hair as foreign body cells and starts destructing them. It is actually called alopecia areata, and creates bald spots on any part of the body.