Chemotherapy generally produces many side effects, which often cause patients to feel unwell or show abnormalities in test indicators. In general, the recovery time for these discomfort symptoms and abnormal indicators is not the same, but most of them do not take more than 1 month. A small number of patients take longer to recover and very few do not return to normal. Some uncomfortable symptoms will disappear quickly, such as allergic reactions caused by chemotherapy drugs, where patients may experience discomfort such as itchy skin or even difficulty breathing, which usually recover within 1-2 days after stopping the drugs or giving anti-allergy treatment. Gastrointestinal side effects such as nausea, vomiting, and diarrhea usually slowly resolve within 2-3 days after the end of chemotherapy, and the longest usually takes no more than 1 week. Some chemotherapy side effects may take longer to recover, for example, bone marrow suppression after chemotherapy leading to blood tests showing a decrease in the number of white blood cells, red blood cells, and platelets, which usually reaches its most severe level 7-10 days after chemotherapy. Recovery begins 2 weeks after the cessation of chemotherapy and most patients can generally return to normal before the arrival of the next cycle of chemotherapy, with a total recovery time of no more than 1 month. It is important to note that a small number of specific chemotherapy side effects may take months, or even years, to return to normal. A very small number of patients may never fully return to normal, leaving so-called sequelae, such as peripheral nerve damage from phytochemicals that can cause paralysis and abnormal sensation in the hands and feet. Some patients can return to normal within 3 months after stopping the drugs with symptomatic treatment, while some patients may need half a year or even longer to recover. Very few patients cannot recover completely and need to take drugs for life to be able to maintain.