The area around the navel is usually not hard in normal people when lying flat. The area around the umbilicus should be flat and soft when lying down. If there is a hard knot or hard lump, it is not normal, and it needs to be clarified whether it is a case of abdominal wall lipoma or fibroma, etc., tumors inside the abdominal cavity, and dilated intestinal tubes. 1. Lipoma or fibroma of the abdominal wall: it is a very common benign tumor of the abdominal wall, which can appear in any part of the body, and is often manifested as a lump of the tumor with hard texture, and there will be the symptom of hard lumps around the navel of a normal person after lying down flat. 2. Abdominal tumors: abdominal tumors will also show hard lumps around the umbilicus, which can be sensed by abdominal palpation, and can be further clarified by abdominal X-ray and abdominal CT, and the patients may have abdominal compression symptoms, and there will be the symptom of hard lumps around the umbilicus of normal people after lying down. 3. Expanded intestinal tubes or stool in the intestinal tubes, this situation is usually felt as a long strip-shaped hard lump. For hard lumps around the umbilicus should be taken seriously, timely to the hospital to clarify what causes, give early intervention measures.