The diaphragm is the primary muscle used in respiration, which is the process of breathing. This dome-shaped muscle is located just below the lungs and heart. It contracts continually as you breathe ...

Pain in the diaphragm — the muscle that separates the chest from the abdomen — can happen for many reasons, such as an injury, pregnancy, and pneumonia. The diaphragm moves downward so the lungs can ...

Diaphragm spasms feel like twitches in the area between the chest and the abdomen. They can occur with or without pain. Possible causes include an injury, nerve irritation, or a rare condition known ...