Umbilical hernia manifests as a bulge around the belly button, mainly because the contents of the hernia include the intestines and omentum. This bulge becomes apparent when there is an increase in abdominal pressure due to crying or other activities, pushing the intestinal contents through the weak area around the navel, resulting in a noticeable protrusion. This bulge has a characteristic feature known as reducibility. It disappears when lying flat or in a calm state, but becomes more apparent and may increase in size when standing or under conditions of increased abdominal pressure, such as crying, shouting, or jumping. Clinically, this reducibility of the bulge is used to diagnose an umbilical hernia.