Stomach Pain After Eating: Food Intolerances vs. Sensitivities vs. Celiac Disease

Postprandial abdominal pain often signals a food-related issue. Distinguishing between intolerance, sensitivity, and autoimmune disease guides proper management.

Food Intolerance (Non-Immune)

• Lactose Intolerance: Lactase deficiency → bloating, diarrhea, cramps after dairy.
• Fructose Malabsorption: Fruit, honey, HFCS → similar GI symptoms.
• FODMAPs: Fermentable carbs (onion, garlic, wheat, legumes) → gas, distension in IBS.
• Histamine Intolerance: Aged foods, alcohol → flushing, headache, GI upset.

Food Sensitivity (Immune-Mediated, Non-IgE)

• Delayed reactions (hours to days), possibly IgG/IgA mediated; testing remains controversial.
• Symptoms: abdominal pain, fatigue, brain fog, joint pain, skin issues.

Celiac Disease (Autoimmune)

• Gluten (wheat, barley, rye) triggers villous atrophy in genetically susceptible individuals.
• Test: tTG-IgA + total IgA while still eating gluten.

Action Plan

1. Keep a detailed food/symptom diary for 2+ weeks.
2. Trial elimination (e.g., low-FODMAP, dairy-free) with dietitian guidance.
3. Rule out celiac before going gluten-free—otherwise testing becomes unreliable.
4. See a gastroenterologist if red flags: weight loss, bleeding, anemia, family history.

Systematic identification beats guesswork. A structured approach finds the trigger faster and prevents unnecessary dietary restrictions.