Small cell lung cancer patients who can not eat after radiotherapy can take drugs to promote appetite or intravenous nutritional support therapy under doctor’s guidance. Small cell lung cancer patients who cannot eat after radiotherapy are mostly considered to be caused by the adverse reaction of radiotherapy, at this time, drugs to promote appetite, such as megestrol tablets, can be taken under doctor’s guidance to increase appetite. If the symptoms are serious, intravenous nutritional support therapy can be given. Normally, appropriate exercise can be used to increase appetite. Drugs should be used under the guidance of physician. Inability to eat after radiotherapy for small-cell lung cancer may also be caused by radiation esophagitis, at this time, the attending physician will evaluate the condition and give hormone drugs if necessary, and at the same time, a nasal nutrition tube can be placed to perform enteral nutritional support therapy or intravenous nutritional support therapy. The treatment of small cell lung cancer mainly includes radiotherapy and chemotherapy, which are generally more sensitive to the treatment, but prone to recurrence and metastasis, so it is necessary to have regular rechecks, and once discomfort or metastasis occurs, it is necessary to consult a doctor in time, and standardize the treatment under the guidance of a doctor.