Illnesses that cause a distended abdomen, pressure and a feeling of fullness include irritable bowel syndrome, indigestion, inflammatory bowel disease and an intestinal parasite infection, according to Healthline. Pancre... More » Health Pain & Symptoms

A distended upper abdomen, also known as diastasis recti, is typically caused by the stretching and resultant thinning of the linea alba tissues along the front wall of the stomach, according to Twiniversity. The linea a... More » Health Conditions & Diseases

To treat a symptom like inexplicable swelling of the stomach, it is important to know the specific cause because there are many possible reasons for this. Some causes can include having a heavy meal, constipation, irrita... More » Health Conditions & Diseases Gastrointestinal Issues
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Common causes of a bloated, protruding abdomen include irritable bowel syndrome, rapid ingestion of food, lactose intolerance, constipation and inflammatory bowel disease, notes Healthline. A bloated abdomen can occur du... More » Health Pain & Symptoms

Indigestion, or a feeling of fullness or discomfort after a meal, is a common stomach, or upper abdomen, complaint, and treatment depends on identifying the indigestion's cause, according to WebMD. Most mild cases of ind... More » Health Conditions & Diseases Gastrointestinal Issues

Bloating causes a feeling of fullness or uncomfortable tightness in the abdomen, according to Healthline. Bloating can also cause visible distension or swelling of the belly. Additional symptoms of bloating include intes... More » Health Pain & Symptoms

Irritable bowel syndrome, ulcerative colitis and inflammatory bowel disease are causes of mucus in stool. Other causes include Chrohn's disease, bowel obstruction and anal fissures, states More » Health Pain & Symptoms