Hi. Thanks for your query. Noted the history about your husband and understood your concerns. Body ache, sweating, chills, fever with tight and painful abdomen can be due to the following reasons: Intestinal infection although the bowel movements are normal at the moment, there can be loose stools later on. Or another possibility is intestinal obstruction with the distal contents emptying as normal bowel movements; there is tight abdomen and pain also. I would advise you the following in such a situation: Take him to the Doctor or to ER so that a proper clinical evaluation can be done for getting the proper diagnosis as to whether there is a septicemia or intestinal obstruction so that further investigations can be done like: X-ray of the abdomen in standing position, ultrasonography of the abdomen, tests of stool, blood and urine and any other tests as may be ordered. Keep him nil orally till ordered by the Doctor or a Nurse. This way the proper diagnosis and further medical and/or surgical management can be done as required.