1 Red blood cells (RBCs) are also called erythrocytes. They make up almost half of blood. Red blood cells are filled with hemoglobin. That's a protein that picks up oxygen in the lungs and brings it to cells all around the body.  White blood cells (WBCs) are also called leukocytes.
Pain originating in the stomach or esophagus is often felt in the upper abdomen and can be due to heartburn, gastroesophageal reflux disease (GERD), or hiatal hernia (weakening in the diaphragm that allows the stomach to protrude into the chest). You may also have gastritis (inflammation of the stomach lining) or ulcers.
Liver pain may be confused with a more general abdominal pain, unless it occurs specifically in the upper right abdomen. Even then, right upper quadrant pain can be due to gallstones, intestinal pain, pancreatitis, or other abdominal disorders.Because pain in the liver area can be caused by many different conditions, some of which are serious, it is important for you to contact your health care provider to determine the underlying cause.ven then, right upper quadrant pain can be due to gallstones, intestinal pain, pancreatitis, or other abdominal disorders. Because pain in the liver area can be caused by many different conditions, some of which are serious, it is important for you to contact your health care provider to determine the underlying cause.