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.
Causes of sinusitis. This is caused by an infection â viral, bacterial or fungal which causes the sinuses to become swollen and blocked by infected mucous membranes. One example of a viral infection is the common cold which often causes sinusitis. The most common cause of sinusitis is a viral infection.