You may have abdominal pain, because your stomach is smaller than it would be if you ate normally and it can't seem to accept what you are eating. Sometimes, in addition to ordinary constipation, which can usually be corrected by adding high fiber foods to your diet and giving your body time to adjust, a more severe situation can develop. This is called "fecal impaction/' in which the digested material in the bowel cannot be excreted but is literally stuck in place. It has to be removed by a healthcare provider such as a nurse or physician.
If you are bingeing or purging alternately with the starvation pattern, you may have severe heartburn because of vomiting or because stomach acid seems to make its way up into your throat (acid reflux), both of which irritate the lining of the esophagus and the pharynx. If you try to drink milk of any kind or eat anything with milk protein, you may also experience heartburn. Many anorexics have severe edema (swelling), often most noticeable in the fingers and legs, but sometimes seen as facial puffiness, which is caused by a loss of sodium chloride (salt). This puffiness is distinct from the facial puffiness of bulimia caused by swelling of the parotid glands. Edema can also occur if you use diuretics.
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Gastroesophageal reflux disease is the medical term for what we know as acid reflux. Acid reflux occurs when the stomach releases its liquid back into the esophagus, causing inflammation and damage to the esophageal lining. The regurgitated acid most often consists of a few compoundsbr acid, bile, and pepsin.