Abdominal breathing is mainly the up and down movement of the diaphragm, so the stomach will contract or expand accordingly.
Abdominal breathing is mainly dominated by the up and down movement of the diaphragm. When inhaling, the diaphragm will fall, which will lead to an increase in abdominal pressure and abdominal distension, whereas when exhaling, the diaphragm will rise, and the abdominal pressure will decrease, and the abdomen will shrink back accordingly.
Abdominal breathing is mainly seen in adult males and can increase the range of motion of the diaphragm. When the range of motion of the diaphragm increases, the lung ventilation will also increase accordingly. Normal abdominal breathing takes about 10-15 seconds and allows you to inhale about 500 milliliters of air.
You can consult your doctor at the hospital.