My husband started feeling some severe abdominal pain on his right side of his stomach what may be the cause? he has no appetite and no enery

Pain : Pain in this area is very tricky since there are many organ systems in the epigastric area and right upper quadrant of the abdomen. - stomach - problems such as gastroesophageal reflux, gastritis, and stomach ulcers can cause pain in these areas - usually worse with eating and worse while laying down - pancreas - pancreatitis, pancreatic stones/blockages can cause epigastric pain, sometimes radiating to the back - liver/gallbladder - hepatitis, gall stones or gall bladder disease can cause pain in the right upper quadrant - intestinal - duodenal ulcers, infections and constipation can cause pain there because the colon loops up into that area. The appendix is also located on the right. - kidney - kidney stones or infections can cause pain in the right upper quadrant, though many people feel it in their backs. And all those are just a few of the things that could be going on. So, your husband's best option is to be seen by a doctor and examined to determine the cause of his pain. Reasons to go to the er are: - high fever - bloody stool - bright green or bloody vomit - severe or worsening pain - difficulty breathing.