You’ve done all the research. Memorized all the key terms to bring to your doctor. But you’re still confused if it’s histamine intolerance or MCAS? You’re not alone. Here’s the truth: they overlap, but they’re not the same thing! Knowing which is driving your symptoms can completely change how you heal. Histamine Intolerance (HIT): 🚫 Can’t break down histamine properly (low DAO/HNMT activity). ⚡ Triggered by histamine from food, gut imbalance, hormones, or stress. ⏳ Symptoms often appear soon a