Post-surgical hair loss can be caused by the surgery itself, by local nutrition, or by mental stress. For patients undergoing chemotherapy after surgery, certain chemotherapeutic drugs can also cause hair loss, which is caused by the hair follicles going from the reproductive phase to the quiescent phase for various reasons. It takes about 3-4 months for the hair follicles to return from the resting phase to the anagen phase, so there is no need to be overly nervous, especially for patients after chemotherapy, it is possible that the hair will grow out rapidly and be thicker, denser and darker than before. For patients with hair loss after surgery, first of all, they should strengthen their personal nutrition and eat more high-protein and high-vitamin food to help their body recover. You should also pay attention to rest, avoid strain, participate in more social activities, avoid solitude, enhance the mood of pleasure, improve the situation of tension and anxiety. In addition, you can also eat more foods rich in vitamin A, vitamin B and vitamin F to help the growth and development of hair follicles, such as lean meat, eggs, animal liver and spinach, carrots, etc. One should stay away from hair dryers to avoid further damage to the hair follicles and hair, which can affect their growth and development.