During pregnancy, the umbilical cord passes through a small opening in the baby's abdominal muscles. The opening normally closes just after birth. If the muscles don't join together completely in the midline of the abdomen, this weakness in the abdominal wall may cause an umbilical hernia at birth or later in life.
Ileus may also be caused by an infection inside the abdomen, such as appendicitis or diverticulitis. Disorders outside the intestine, such as kidney failure, an underactive thyroid gland, or abnormal levels of blood electrolytes (low potassium levels or high calcium levels, for example), may cause ileus.
Below are some of the common causes for elbow bursitis. 1  Repetitive strain and stress to the elbow such as from playing sports, lifting weights or resting elbows on hard surfaces for long periods of time. 2  Sudden impact such as from a fall, sports injury or an accident. 3  Natural wear and tear of the elbow joint.