During chemotherapy, companion care can provide assistance to the patient on the one hand; on the other hand, it can also give the patient confidence to promote recovery. When oncology patients undergo chemotherapy or when patients go home to recuperate, they may need family members or friends to act as companions to help them. For example, they can provide assistance to patients in dealing with symptoms such as fatigue, weakness, muscle and joint pains of chemotherapy, as well as daily activities such as transportation, cleaning, personal care, and eating. According to some studies, more than half of the patients need a companion during the recovery period after chemotherapy, and women are more likely to need a companion than men, and a companion is an important part of the physiological and psychological influences after chemotherapy. Although companion care cannot cure the complications caused by chemotherapy, it is very important for cancer patients to build up their confidence in recovering from chemotherapy.