Lack of appetite one month after lung cancer surgery may be caused by side effects of drug stimulation, slow bowel movement and emotional factors. 1. Side effect: after lung cancer surgery, some drugs may be applied to help eliminate residual cancer cells, which may produce side effect and cause gastrointestinal discomfort and loss of appetite, so the patient can apply digestive drugs to help relieve the symptoms. 2. Slow bowel movement: after lung cancer surgery, patients need to stay in bed and reduce the amount of physical activity. This may result in slower peristalsis and reduced digestive function, which may lead to loss of appetite. 3. Emotional factors: After surgery, patients with lung cancer are in a weak condition, and they may suffer from emotional anxiety and irritability, which may cause loss of appetite. If the patient has no appetite one month after lung cancer surgery, he/she needs to contact the attending doctor in time to clarify the cause of appetite loss, and then carry out symptomatic treatment and care.