Contents. 1  Calf rash AND Forearm rash: Causes of All Symptoms. 2  Calf rash OR Forearm rash: Causes of Any Symptom. 3  Calf rash: Causes.  Calf rash: 1  Introduction. Forearm rash: Causes.  Forearm rash: 1  Introduction. Calf rash and Forearm rash and Behind knee rash (15 causes)  Calf rash and Forearm rash and Finger rash (15 causes) Calf rash and Forearm rash and Foot rash (15 causes) Calf rash and Forearm rash and Groin rash (15 causes) Calf rash and Forearm rash and Hand rash (15 causes) Calf rash and Forearm rash and Knee rash (15 causes) Calf rash and Forearm rash and Kneecap rash (15 causes)
Gas in the digestive tract - the esophagus, stomach, small intestine, and large intestine - comes from two sources: 1  Swallowed air.  Normal breakdown of certain undigested foods by harmless bacteria naturally present in the large intestine, also called the colon.
Gas also appears in the stomach and intestines either as a result of swallowing air or production of gasses by intestinal bacteria. Thus the stomach and intestines contain a mixture of digesting food, liquid, and gas. As the muscles of the stomach and intestines contract and squeeze their contents, the contents move. It is the movement of the food, liquid, and particularly the gas that gives rise to borborygmi.