warum vertrage ich plötzlich keinen kaffee mehr — when to see a doctor?

Sudden coffee intolerance can stem from hormonal shifts (e.g., pregnancy, menopause, stress-induced cortisol changes), gastrointestinal issues (e.g., gastritis, IBS, leaky gut), medication interactions, or altered caffeine metabolism due to genetic variants (e.g., CYP1A2). Increased histamine sensitivity or developing food intolerance are also possible. See a doctor if symptoms persist >2–3 weeks, include pain, nausea, heartburn, diarrhea, or palpitations, or if accompanied by unexplained weight loss, fatigue, or blood in stool. A gastroenterologist or allergist can perform endoscopy, breath tests, or elimination diets. Caution: anecdotal reports and forums are not substitutes for medical evaluation. Consumer DNA/lab tests (e.g., MyBody-X) offer clues but not diagnoses. For acute chest pain or shortness of breath, call emergency services immediately.