The stomach is a muscular organ that lies between the esophagus and the small intestine in the digestive system. It plays an important role in breaking down food and absorbing nutrients from the food we eat.


When there is no air inside the stomach, it can still rise and fall due to several factors. One of the main reasons for the movement of the stomach is due to the action of the diaphragm, which is a large muscle that separates the chest cavity from the abdominal cavity. The diaphragm contracts and relaxes during breathing, causing the volume of the chest cavity to increase and decrease, respectively. This movement of the diaphragm can also cause the stomach to move up and down, which is why you may feel your stomach rise and fall even when there is no air inside.


Other factors that can cause the stomach to rise and fall include the movement of food and digestive juices through the digestive system, the contraction of the stomach and intestinal muscles, and the movement of gas within the digestive tract. Additionally, the movement of the abdominal muscles during physical activity can also cause the stomach to move.


It's worth noting that if you're experiencing significant and persistent changes in your stomach movements or other digestive symptoms, it's always best to consult with a medical professional to rule out any underlying health issues.