Extreme fatigue and stomach pain after eating: what to know

The timing after meals can offer clues but does not prove a diagnosis. Acid reflux or gastritis may cause burning or upper abdominal discomfort. Gallstones can cause pain after rich meals, often in the upper right abdomen. Coeliac disease and Crohn's disease may cause abdominal symptoms with fatigue through inflammation or reduced nutrient absorption. Food poisoning and gastroenteritis may bring cramps, diarrhoea, vomiting, fever, and fluid loss. Diverticular disease more often affects the lower abdomen.

Note the meal, pain location, timing, duration, bowel changes, vomiting, fever, weight change, and whether symptoms recur with a particular food. This record can make a consultation more useful.

Choose small, simple meals if eating worsens discomfort and sip fluids. Avoid alcohol and foods that clearly trigger symptoms until you have advice. Do not remove major food groups for a long period or begin a gluten-free diet before discussing testing for coeliac disease, because this may affect the assessment. Arrange a review if fatigue or pain keeps returning.

Seek urgent care for severe or steadily worsening pain, a rigid or swollen abdomen, repeated vomiting, blood in vomit or stool, black stools, yellowing of the skin, fainting, confusion, high fever, or inability to keep fluids down. Sudden pain with marked weakness also needs prompt assessment.

Ask whether the meal pattern points toward reflux, gastritis, gallstones, infection, or food-related inflammation; whether blood or stool tests are needed; and which foods or medicines to avoid while symptoms are investigated.