Symptoms of nausea after 10 days of rectal cancer surgery may be caused by postoperative adverse reaction, adverse reaction of drugs, postoperative intestinal adhesion, etc. If persistent or progressive nausea occurs, the patient should consult doctor in time to find out the cause of the disease, and the doctor will give targeted treatment. 1. Postoperative adverse reaction: 10 days after rectal cancer surgery, patients’ body is still in recovery period, the immunity and resistance of human body is relatively low, together with the psychological factors after surgery, such as depression, anxiety, etc., nausea and other symptoms may appear. 2. Adverse reaction of drugs: Patients with rectal cancer commonly use targeted therapy drugs such as bevacizumab, cetuximab, etc. Post-operative chemotherapy may also use 5-FU, cisplatin and other chemotherapeutic drugs, which can cause gastrointestinal reactions such as nausea and vomiting. 3. Intestinal adhesion: In intra-abdominal surgery such as rectal cancer surgery, the trauma can cause intestinal adhesion and restriction of intestinal peristalsis, which may cause nausea and vomiting, accompanied by abdominal pain, abdominal distension, stopping defecation and gas evacuation, and other obstruction symptoms, and in serious cases, it may cause metabolic disorders of electrolytes and even shock. If nausea occurs after 10 days of rectal cancer surgery, patients should consult doctor in time, who will clarify the cause of the disease and provide relative treatment if necessary.