I am having baldness for 3 years. how it can be treated?

Yes: There are all kinds of treatments available but it is important to get to the root cause of your baldness.

Get dermatology eval: Medications - Minoxidil (Rogaine) & Finasteride (Propecia), Surgical - Hair transplant. Eat a nutritious diet to avoid deficiencies. Avoid hairstyles that pull hair tightly. Use gentle shampoo. Avoid hair dryers, permanents or curling irons. Consider use of a wide toothed comb. Consider acupuncture. Genetics plays the biggest factor in balding for most people- you may or may not have success.