Final answer:
Irritable bowel syndrome (IBS) is the most common GI disorder marked by symptoms like abdominal pain, cramping, and altered bowel movements without underlying damage to the GI tract.
Step-by-step explanation:
The most common gastrointestinal (GI) disorder characterized by abdominal pain, cramping, and a disturbance in the motility of the GI tract is irritable bowel syndrome (IBS). IBS is a chronic condition that affects the large intestine and can cause a range of symptoms including bloating, gas, diarrhea, and constipation. Unlike diseases such as diverticulosis, celiac disease, colitis, and reflux, which have more specific causes or affected areas, IBS is often a diagnosis of exclusion, meaning it's diagnosed after ruling out other conditions. IBS does not cause changes in bowel tissue or increase the risk of colorectal cancer.