How long it takes for hair loss treatment to work is mainly based on the type of disease, severity of the condition, and the treatment plan. There is no exact time for how long the treatment will take effect. 1. Causes: Common alopecia areata diseases include androgenetic alopecia, patchy baldness, resting alopecia, ringworm, etc. There are differences in the treatment time for different diseases. 2. Severity of the disease: if the scope of hair loss is small and the condition of hair follicles is good, the faster the treatment time will be. If the scope of hair loss is large and the condition of hair follicles is not good, the difficulty of treatment will be higher and the treatment time will be longer. 3. Treatment program: generally for hair loss can use drugs, surgical treatment, phototherapy and other methods, treatment time will also be affected by the treatment program. How long does it take for hair loss treatment to work is affected by many factors and there is no specific and accurate time.