Left-sided abdominal pain that worsens after eating is often caused by gastritis (inflammation of the stomach lining), ulcers, indigestion, constipation, irritable bowel syndrome, or problems with the colon or spleen. For temporary relief, try eating smaller, more frequent, low-fat meals, and avoid spicy or greasy foods. Keeping a food diary and noting symptom patterns can help identify triggers. Consult a gastroenterologist if the pain is severe, persistent, or accompanied by any unusual symptoms.