Mast Cell Activation Syndrome (MCAS)

July 22, 2022

By: Belmar Pharmacy

Mast cell activation syndrome (MCAS) is a condition that causes mast cells to release an inappropriate amount of chemicals into your body. This causes allergy symptoms and a wide range of other indications.


  • Heart: rapid pulse (tachycardia), low blood pressure (hypotension) and passing out
  • Skin: itching (pruritus), hives (urticaria), swelling (angioedema) and skin turning red
  • Lung: wheezing, shortness of breath, and harsh noise when breathing (stridor) that occurs with throat swelling
  • Gastrointestinal tract symptoms: diarrhea, nausea with vomiting and crampy abdominal pain

Common Triggers

  • Stress
  • Medications
  • Insect Stings & Bites
  • Alcohol
  • Exercise

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