Irritable Bowel Syndrome (also саllеd IBS, Spastic Colon, Mucous Colitis, Spastic Colitis, Nervous Stomach, or Irritable Colon) is a chronic condition involving the large intestine/bowel. It is the most common condition diagnosed by gastroenterologists. Individuals with Irritable Bowel Syndrome may experience abdominal pain, gas, constipation, cramping, and/or diarrhea. Unfortunately, there is no cure for IBS. Generally, the goal of treatment is to relieve your symptoms.