What causes IBS?
The causes of IBS are not well understood. Researchers believe a combination of physical and mental health problems contribute.
Signals between the brain and nerves of the small and large intestines may not be working properly.
Slow movement or motility in the colon can lead to diarrhea. Sudden muscle contractions that come and go, can cause abdominal pain.
A lower pain threshold for bowel stretching caused by gas or stool can be another symptom encountered by people with IBS.
Panic disorder, anxiety, depression and post-traumatic stress can also be a contributing factor.