Anxiety can cause abdominal pain for a variety of reasons. The most common reason is that the person has developed an “abdominal knot” which causes a lot of pain. It is also possible for someone to have a gastrointestinal disorder such as ulcers, Crohn's disease, or celiac disease. You should take care of yourself in order to get rid of these knots and get relief from the abdominal pain. You should take a warm shower with Epsom salts mixed into the water. The reason why people do this is that the heat helps loosen the muscle tissue and reduces the pain. You should drink lots of fluids. This helps you to stay hydrated.