Bloating around the belly button in the middle of the night may be caused by eating more gas-producing food before going to bed, intestinal flora imbalance, intestinal obstruction and other factors. 1. Eat more gas-producing food before going to bed: Certain foods, such as potatoes, sweet potatoes, rotting bamboo, etc., enter the gastrointestinal tract, may produce more gas. If you eat more gas-producing food before going to bed, you may experience bloating around your belly button in the middle of the night. 2. Intestinal flora imbalance: the intestinal tract has symbiotic bacteria, probiotics, harmful bacteria three types of bacteria, when the number of harmful bacteria increases, on the one hand, can cause damage to the intestinal wall, resulting in intestinal peristalsis slowdown; on the other hand, may decompose intestinal contents, producing some gas, in the combined effect of the two, may lead to bloating around the belly button in the middle of the night. 3. Intestinal obstruction: when an obstruction occurs in a certain part of the intestine, it is difficult for food to pass through the obstruction site, which may lead to accumulation of material and gas at the upper end of the obstruction site, and then the symptoms of bloating around the belly button in the middle of the night will appear. When there is a bloating around the navel in the middle of the night, you should consult a doctor in a timely manner, under the guidance of the doctor to improve the routine examination of feces, fecal culture, X-ray examination, etc., to clarify the cause of the disease, and active treatment.