K55-K64: Other diseases of intestines

K59: Other functional intestinal disorders

"Other functional intestinal disorders" is a group of conditions that affect the way the intestines work. These disorders do not typically alter the physical structure of your intestines, but can lead to chronic discomfort, pain, or changes in bowel habits. The group includes conditions like constipation, diarrhea, and irritable bowel syndrome (IBS). Causes can vary but often involve a disruption in the balance of the muscle activity or nerves in the gastrointestinal (GI) tract. These imbalances can result from various factors such as diet, stress, or certain medications. Symptoms range from bloating, belly pain, and changes in bowel movements to weight loss and fatigue. These conditions can be ongoing or recurrent and vary in severity from person to person.