Problems: Constipation (a condition where waste becomes dry and hard and movements are difficult, caused by lack of water and or fiber). Nausea (the feeling of discomfort that precedes vomiting, caused by motion sickness, pathogens, medications, dehydration). Gallstones (cholesterol in bile crystallizes and blocks the bile duct between the small intestine and gallbladder creating pain in the upper portion of abdomen, nausea, fever, and vomiting).