Delayed cycles of chemotherapy for breast cancer may affect the effectiveness of treatment. After receiving chemotherapy, breast cancer patients should follow the doctor’s instructions and seek medical treatment on time, because cancer cells may have cyclic development in the body. When breast cancer patients delay the chemotherapy cycle, it may cause some unkilled cancer cells in the body to grow and multiply, thus affecting the effect of chemotherapy, to which patients should pay attention. For some patients who cannot seek chemotherapy in time due to special circumstances, they should inform their doctors in time so that the doctors can evaluate their conditions and reformulate the treatment plan to achieve the ideal treatment effect. For breast cancer patients, in addition to chemotherapy, radiotherapy, endocrine therapy, targeted therapy, etc. can also be performed with doctors to help control the progress of the disease. It is suggested that breast cancer patients should consult regular hospitals for examination and treatment, and pay attention to maintaining physical and mental happiness in daily life, communicate with others more often, and have psychotherapy when necessary. Breast cancer patients should also strengthen breast care, wear loose, pure cotton underwear, avoid clothing friction stimulation, hand rubbing and so on.