Navicular abdomen refers to the patient in supine, the level of the anterior abdominal wall is obviously low, in severe cases, the anterior abdominal wall depression is almost close to the spine, the rib arch, iliac crest and pubic symphysis are exposed, and the abdominal shape is like a boat. The boat-shaped abdomen is the manifestation of the patient’s extreme malnutrition state. It is usually seen in chronic wasting disease caused by extreme wasting, malnutrition, etc. The patient’s subcutaneous fat completely disappeared, and the abdominal fat and intra-abdominal fat also completely disappeared. If the navicular abdomen is caused by simple malnutrition, enteral and parenteral nutritional support therapy can be carried out; if it is caused by tumor, generally in the nutritional support at the same time need to carry out a systemic examination, clear diagnosis after surgical resection treatment, or with radiotherapy. It is recommended to go to the hospital as soon as possible, after clarifying the cause of the disease, according to the doctor’s guidance for standardized treatment, so as not to delay the condition.