Understanding Triggers in MCAS

For people with MCAS, everyday life can sometimes feel like navigating a minefield of potential reactions. One of the challenges of MCAS is the wide range of triggers many people face, which are typically harmless for other people.

Everyone’s experience with MCAS is different. While some people may have clear, consistent triggers, others may struggle with reactions that seem unpredictable or vary day to day. That’s why identifying and understanding your own triggers is an important part of managing the condition. Learning about common triggers and how they affect you personally can help reduce symptoms and may prevent flares. 

Common triggers

MCAS triggers vary from person to person and can include foods, fragrances, temperature changes, medications, infections, hormones, exercise and physical or emotional stress.

Triggers can also change over time - something tolerated one day may cause symptoms another. Recognising your own patterns can help you understand and manage your symptoms.

Some people are triggered by just a few specific things, while others may react to many different things.

Understanding YOUR triggers

Triggers are anything that can cause mast cells to become activated and release chemical mediators like histamine, leading to symptoms. People with MCAS can react to a wide variety of triggers, and these triggers differ from person to person.

Sometimes just one trigger is enough to cause a reaction; other times, it’s the combined effect of several small triggers that pushes the body over its threshold.

Each person’s trigger profile is unique, and it can take time to figure out what affects you. Even common triggers don’t impact everyone.