Yes, constipation can cause nausea, especially when stool moves slowly through the colon or becomes difficult to pass. Nausea may also occur when constipation is part of a broader digestive motility problem.
Research shows that people with chronic constipation often report other digestive symptoms, including bloating, abdominal discomfort, and nausea. Some people with chronic nausea also have delayed movement through the colon or problems emptying the rectum, even when stomach emptying is normal.
Constipation and nausea may occur together because the digestive tract works as one connected system. Changes in bowel movement, intestinal sensitivity, and communication between the gut and brain can cause symptoms in both the upper and lower digestive tract. However, constipation is not always the only cause of nausea.
Medical evaluation is important when nausea or constipation is persistent, severe, or keeps returning. A gastroenterologist can check for bowel movement or evacuation problems and recommend appropriate treatment. Avoid taking laxatives, anti-nausea medicines, or other treatments regularly without medical guidance.