Practical tips for living with Mast Cell Activation Disorder (MCAS)
Living with MCAS can feel like your body is constantly on edge.
One day it’s hives.
The next it’s reflux, nausea, brain fog, dizziness or crushing fatigue.
Sometimes it’s a reaction that feels dramatic.
Sometimes it’s subtle but relentless.
And the hardest part?
It’s unpredictable.
You can eat the same food twice and react once.
You can tolerate something for months and then suddenly you can’t.
You start second-guessing everything, food, environments, supplements, even your own body.
MCAS is layered. It’s not just “a histamine issue.”
It involves the immune system, the gut, and the nervous system, all talking to each other.
The good news is this:
There are practical, steady ways to lower reactivity.
In this blog, I’ll walk you through how I approach MCAS using nutrition, gentle lifestyle shifts, and nervous system regulation. So, we are not just suppressing symptoms, but actually reducing the overall load on the body.
Because the goal isn’t perfection.
It’s helping your symptoms fade into the background so you can live your life with more predictability and less fear.
Environmental allergens triggering MCAS
Understanding MCAS Triggers
Mast cells are responsible for releasing the chemical histamine (as well as other chemicals that cause an inflammatory response) which are vital in defending the body against threats. In general, in people with MCAS, these mast cells are overactive. They release excessive amounts of chemicals in response to triggers that may not normally cause a reaction. These triggers can include:
Food reactivity to anything or everything
Environmental allergens (e.g., pollen, dust, mosquitos, head lice, mold)
Medications (the extra additives called excipients or colours/flavours)
Temperature changes (the seasons as well as pressure drops, muggy or hot weather) Read more about how this is linked to POTS here
Stress (different times in your life, these symptoms may be better or worse)
And MORE
Understanding what may trigger your symptoms is the key to managing MCAS effectively.
BUT! When it comes to mast cells they may have reacted to an event or combination of the above up to 72 hours beforehand. So, whilst a it can be helpful to use a symptom diary to track patterns and identify potential triggers over time. It is important to look backwards in the days before.
Practical Tips for Managing MCAS
Look at your health pillars
Before “blaming” one food or the weather. Evaluate your health pillars using my Whole Body Method.
The nervous system, Digestive system and the Immune system.
1. The Nervous system
Basically your brain tells your body what to do. Your nervous system in your brain particularly the autonomic nervous system in this context decides how the body is going to respond to stress. Stress (such as arbitrary term) but anything external that heightens or lowers symptoms in the body is considered stress. The response from the brain to the body could be feeling calm, running away, staying and fighting or freezing.
Read more about why nervous system support comes first Here
Histamine as well as being a chemical that affects the digestive system, skin and immune system ALSO affects the brain. Histamine (and other chemicals) produced by mast cells heighten the Sympathetic nervous system - Fight or Flight. This could show up in your body as:
Anxiety, that doesn’t really feel like anxiety
Fast heart rate
Running to the bathroom
Intense nausea
Feeling like you are overheating, sweating, shaking
Getting really angry or frustrated
Feeling like you have boundless energy, want to go for a run, endorphins
Waking in the night covered in sweat
And MORE
The next time you look at that one food with fear or blame, instead look at your life…
What is going on in your life? Is something (aside from your health) stressing you out?
Are you going through a break up?
Did you move house?
Does work suck?
Is your child going through puberty?
Is your child having difficulty at school?
We all have times of increased stress in our lives (I just renovated my house), these are usually when symptoms show up the most. I am certainly not naive that we cannot “turn off” the stress. But we can create more perspective and tolerance to it’s effects on the body.
Incorporating calming brain and body techniques into your daily life can help reduce symptoms and promote overall well-being with MCAS, POTS, HSD or hEDS.
Pacing: The art of taking restful breaks to be able to do more later. Are you chronically exhausted and have nothing left for the next day? Yep, your mast cells heightening your nervous system will do that (along with hypermobility and POTS). Learning how to slow down and add in the below regulation, can help to reduce symptoms.
EFT Tapping, Emotion Release Technique, Mindfulness, breathing and Meditation: Practicing any one of these for just a few minutes each day can help calm the nervous system and reduce the overall stress load on your body = less histamine travelling to the brain and reeking havoc! If you cannot sit still to start with or your mind wanders, it is OKAY. This is actually why I love EFT or ERT because it means I have to do something with my hands and keeps me going.
Gentle Movement: Intense exercise can be a trigger for people with MCAS. It raises cortisol and other stress hormones, which sets off histamine. Focus on gentle, low-impact activities like yin yoga, walking, or swimming, gentle dancing and listen to your body to avoid overexertion.
Sleep: A Good sleep routine is invaluable in MCAS, POTS, hEDS and HSD. These pesky mast cells become more active between the hours of 10pm and 4am. Aim to establish a consistent sleep time, limit exposure to screens before bed, try using a red light, reading and creating a calming bedtime ritual to support restful sleep.
2. Your digestive system
Your digestive system is my second health pillar, looking at how it works as well as nutrition. You will not see any restriction or elimination recommended by me (unless there is anaphylaxis or coeliac disease.) I’ve spent too many useless years in that space personally. Restriction or elimination does not support your gut bacteria or your mental health!
Therefore when you look at nutrition, don’t just look at the food. Look at:
What are you actually eating? Any fruit or vegetables?
Are you eating throughout your day?
Are you sitting and enjoying your food?
Are you eating at your desk whilst scrolling on your phone?
Is your child eating enough? Are they hydrating well through the day?
What is happening inside your gut:
How is it functioning? Are you constipated or is your poop loose? Does your stomach look like a balloon? Are you rapidly losing weight?
What are your nutrient levels doing?
Did your doctor tell you everything was fine, but you still feel like shit? (Yep, me too!)
It is true there are higher and lower histamine foods and reducing some higher histamine foods can be helpful to SOME individuals. BUT, doing a full histamine elimination diet has not been shown in research and I have not seen anecdotally for it to be beneficial in supporting MCAS.
Strategies such as:
Eating consistently through your day: Reduces histamine/mast cell spikes and keeps everything stable.
Balancing histamine through the day: Eating a mix of high and low histamine foods through the day, can prevent large histamine dumps to the brain and body at night.
Eat Fresh (or Frozen): Freshly cooked foods tend to be lower in histamine compared to leftovers or packaged foods. If you are unable to eat fresh, freeze meats straight away and thaw them quickly using a microwave or submerge them in water if vacuum-sealed. This can help minimise the histamine content.
Hydration: Drinking plenty of water can help flush excess histamines from your system, keeping you hydrated and supporting overall health.
To understand more about the link between hEDS/HSD, POTS and MCAS, get my free guide HERE
Wearing a light shirt to stop mast cells and histamine reacting on the skin
3. The immune system:
Most of the immune system is contained within the digestive system. However, there are mast cells on the skin and they are affected by the environment around us. This might show us as:
Pressure marks from underwear or handbags
Itchy hands
Small itchy red bumps
More pimple like sore cysts
Welted lines when you touch your skin that take a long time to go away
As well as the usual hay fever symptoms of itchy, runny eyes, nose and ears
Many people with MCAS are sensitive to allergens, chemicals, or temperature extremes, so making small adjustments to your environment can have a big impact.
What is happening in your environment/home or living space?
Are you always getting sick?
Are you using a lot of strong cleaning chemicals?
Are you wearing chemical based makeup everyday and reacting to it?
Do you feel fine in other places, but get sick as soon as you enter your home?
Here are some strategies to support your immune system and mcas:
Looking for mold: Mold can be a huge trigger in MCAS, where you are constantly getting exposure. Aim to reduce dust, mold, and pollen in your living space. Keeping windows closed during high-pollen seasons can also help limit exposure. Vacuuming carpets and floors regularly.
Fragrance-Free Products: Switch to fragrance-free, hypoallergenic household products, skincare, and cleaning supplies. Many chemical fragrances can trigger mast cell reactions. Minimising exposure can really support symptom reduction.
Control Temperature Changes: Sudden changes in temperature, whether from a hot shower, cold weather, or exercise, can trigger mast cell responses. Aim to maintain a stable indoor temperature and avoid overly hot or cold environments when possible. Try not to continue activities that really make you overheat and take breaks in exercise.
Clothing Choices: Opt for natural, breathable fabrics like cotton or bamboo to minimise skin irritation, which can be a trigger for some people with MCAS. Wearing a light scarf or cotton shirt in the wind can stop mast cells reacting on the skin.
Work with a Knowledgeable Practitioner
MCAS can be A LOT to manage, and many traditional healthcare providers may not fully understand the condition. Working with a practitioner who specialises in MCAS and related conditions can make a significant difference. Here at hypermobile Natural Therapies we can help you to:
Work on your health pillars
Identify your personal environmental triggers
Develop a personalised management plan, including nutrition, lifestyle adjustments, and supplementation.
Provide ongoing support and adjustments as your needs change.
View our Thriving Body Blueprint Package which uses our Whole Body Method HERE
Supplementation for MCAS Management
While your nutrition plan and lifestyle adjustments are foundational, some individuals with MCAS may benefit from supplementation to manage symptoms. Common supplements for MCAS include:
Quercetin: A natural flavonoid that helps stabilise mast cells and reduce histamine release. Cooked apples contain quercetin and in low and slow amounts are generally well tolerated by individuals with MCAS.
Vitamin C: Many fruits contain vitamin C Known for its antihistamine properties, vitamin C can help support the immune system and reduce mast cell activation. Blueberries are lower histamine and contain high amounts of vitamin C.
Polyphenols: Compounds in fruits that reduce inflammation = reduced mast cell activation. Red fruits contain these including red grapes, pomegranates, strawberries, red dragon fruit. Eat what you tolerate, in small amounts to start with.
You can buy all of these in supplement form. As with any supplement or food, it is crucial to consult with a healthcare professional to ensure it is appropriate for your condition and that you are taking the correct dosage.
Final Thoughts
It’s NEVER just ONE thing…
It’s a tower. If one of the pillars is not stable, the whole thing will most likely come toppling down. Then you will notice that you can eat less and less and your digestive system or skin will cause you more issues.
Living with MCAS can be challenging. But, by supporting your health pillars and making strategic adjustments to your nutrition, environment, and lifestyle, you can significantly reduce symptoms and improve your quality of life. Improving stress tolerance, staying hydrated, and working with an experienced practitioner are all key elements to finding balance and living well with MCAS.
Remember, progress takes time, so be patient and compassionate with yourself as you implement these changes. Over time, you will find what works best for your body and how to manage your symptoms effectively.
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If you’d like help managing your MCAS and supporting your health pillars. Book your FREE VIDEO discovery call here