Walking and Injuries. Any pain in the chest while walking, no matter what its cause, can be troubling -- especially if you've reached middle age, when the risk of heart disease rises. Such pain may have nothing to do with your heart, however.
The stomach, liver, spleen, gallbladder, and most of the small and large intestines are in the abdominal cavity. Many of the organs of the abdominopelvic cavity are covered by the visceral peritoneum, while the wall of the abdominal cavity is lined with the parietal peritoneum. Peritoneal fluid fills the cavity between the visceral and parietal peritoneum.
The abdomen contains all the digestive organs, including the stomach, small and large intestines, pancreas, liver, and gallbladder. These organs are held together loosely by connecting tissues (mesentery) that allow them to expand and to slide against each other. The abdomen also contains the kidneys and spleen. Many important blood vessels travel through the abdomen, including the aorta, inferior vena cava, and dozens of their smaller branches.