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| Location of MCAS | Symptoms |
|---|---|
| Gastrointestinal system | Abdominal pain, bloating, constipation, diarrhea, nausea, gastric hypersecretion, dyspepsia, heartburn |
| Skin | Urticaria, flushing, pruritus, angioedema |
| Respiratory | Wheezing, throat swelling, hoarseness, nasal congestion, nasal pruritus |
| Neurologic | Headaches |
| Cardiovascular | Hypotensive syncope or near syncope, tachycardia, anaphylactic shock |
