HEFK refers to High Intensity Ultrasound Focused Knife, which belongs to a type of local ablation treatment. Post-surgical bloating may be related to nerve irritation, infection, and the site of surgery. High-intensity ultrasound focused knife is widely used in clinic, such as breast tumor, uterine fibroid, liver tumor and prostate tumor, its principle is to use ultrasound to penetrate and release heat to make the tumor necrosis. 1. Nerve stimulation: there are phrenic nerves, abdominal aortic plexus, superior and inferior mesenteric artery plexus in the abdominal cavity, which may be stimulated during the process of high-intensity ultrasound focused knife, causing gastrointestinal reactions, usually manifesting abdominal distension and abdominal discomfort. 2. Inflammation and infection: If there is inflammation and infection in the case of disease, in the process of high-intensity ultrasound focused knife may aggravate the inflammation, proliferation, the stomach and intestines will be affected by inflammation, intestinal peristalsis slows down, the patient tends to have abdominal distension. 3. Surgical site: the use of high-intensity ultrasound focused knife for the treatment of liver tumors may affect the production of bile, and digestion will be affected after the operation, and there will be a feeling of bloating at this time. If you have the feeling of flatulence after surgery, you should go to the hospital in time to get a clear picture of the specific situation, so as to avoid the progression of the disease.