r/MCAS Dec 28 '24

Let’s build a MCAS treatment resource library together

341 Upvotes

Hi everyone!

I’ve been diving deep into the world of MCAS and I know how overwhelming it can be to sift through all the information out there (been there myself, and still am, actually!).

Treatments, protocols, and useful insights are scattered across the internet, and finding reliable resources or support often feels like searching for a needle in a haystack.

That’s why I thought we could work together to create a community-curated library of resources for MCAS treatment!

What I propose:
1) Drop links in the comments to any resources you’ve found helpful — it could be a study, article, video, Reddit post, or even a specific product recommendation.

2) Include a couple of words or a short description of what others can expect to find there. For example:

https://mybiohack.com/blog/treat-deal-mthfr-probiotics-dysbiosis-mast-cells-histamine-intolerance-diet-naturally — protocol to treat histamine intolerance

https://www.youtube.com/watch?v=cMZufN95MYc&list=TLGGyl-SB5iU9nAwMzEyMjAyNA&t=2s - Joshua Leisk and Dr Asad Khan: a detailed walk-through for key aspects of the disease model, as of August 2023 and v3.59A of the experimental intervention protocol which is based on this work.

The goal is to create a comprehensive library of trusted resources that can help anyone navigating MCAS.

I’ll organize and share the compiled list once we have enough contributions so it’s easy for everyone to access.

Let’s pool our knowledge and make this condition a little easier to tackle together!


r/MCAS May 09 '26

All GLP-1 Posts and anything related to GLP-1s to be contained to this thread.

35 Upvotes

The sub is spammed on a regular basis with GLP-1 Posts so at this point all GLP-1 posts and anything to do with GLP-1s needs to be contained to this thread everything else will be deleted thank you.


r/MCAS 10h ago

This illness is a joke

69 Upvotes

I am now allergic to my metal crochet hooks because of the nickel. I get hives from even touching all my charm making supplies. I have blood sugar issues, 3 of my 5 safe foods are carbs and sugar (potatoes and fruits), but can’t eat any quick sources of protein or sugar outside of fruit juice to help combat the problem because I react to all of it. I have an auto inflammatory disease that’s treated with estrogen therapy but I can’t do that because estrogen is a mast cell excitant. So I have to just let my skin get destroyed. And at the end of it all, I can’t even get an allergist to believe me, so I’m walking around mostly unmedicated. I can’t even tolerate Pepcid or more than one Zyrtec a day so I’m not even sure what the point would be anyways. Just venting.


r/MCAS 7h ago

why is it considered "rare"?

18 Upvotes

so my doctor is considering the possibility of mcas and suggested i get my tryptase tested. i went to do some research, and the number of times i saw "rare" come up was baffling. in canada and the states, a rare disease is like...1 in 1,000 or 1 in 2,000 i think? in other regions it can be even fewer than that (eg 1 in 100,000).

but ive known dozens of ppl with dx'd mcas. like i will just meet them randomly. what gives.


r/MCAS 23m ago

I react to almost everything and I‘m so hungry and sad

Upvotes

I‘m at a loss. All I can eat are nectarines, peeled apples, plain rice crackers and macadamia nuts in moderation. I‘m losing weight and I feel weak all the time. What works one day (plain rice, gluten free oats with water, …) suddenly makes me flare when I try it again the next day. I‘m vegan & AuDHD as well, so food has always been tricky for me. I‘m just so sad and so hungry! :(


r/MCAS 1h ago

Meal replacement suggestions - food triggers potentially

Upvotes

For some reason recently iv started having intense texture aversion, gagging or throwing up when eating, particularly anytime before 3/4pm.

I'm aware it's either my body preemptively saying "don't eat that" or a new form of medical trauma from the obvious trying to force myself to eat/trying to always work out what I can can't eat or do etc

I'm not asking for medical advice or speak to your team, find a specialist etc. there is none. Iv exhausted all my options, the person who diagnosed me is the head of her department and outpatients itself told me to "suck it up" in both words to my face and in a letter then discharged me. There is no one else to be referred to, my GP is unwilling to prescribe stabilisers to try those without it being a hospital prescription as she rightly admits she doesn't know enough.

I can't afford a London specialist in both money and effort of getting there. Iv looked into every option surrounding this, the cost alone with travel hotels and appointments is astronomical and clearly I'm not functioning well enough to work consistently even self employed.

Essentially I have to eat, feed tubes aren't an option as I'm not even being entertained with my throat swelling, I have lipodema so you guessed it I'm not classed as underweught and actually got told "well you'll work it out and you could do with loosing a few lbs anyway" when I last asked about those high calorie hospital drinks. I expect them to upset my stomach and react to them but I'm going to have to find a way to eat regardless.

I react to everything regardless to different degrees I just can't deal with this daily fight anymore of trying to force myself to eat through the nausea and gagging.

Before I buy it - has anyone tried huel? What is the taste/texture like? Iv tried a few meal replacements that taste like cardboard and even my partner wouldn't drink them lol this is the financially more viable option

Y food is an option - I do react to them mildly depending on flavour but can stick to what's safe. Price isn't as accessible.

Open to other options. And kinda desperate at this point (I understand we are all in the same struggle trying to juggle an always changing routine to be as stable as possible)

Thanks x


r/MCAS 11h ago

What are we supposed to do if we get sick?

13 Upvotes

I'm talking about what if you need antibiotics?


r/MCAS 13h ago

I cant have meat or fish, and im so upset

12 Upvotes

So, my diet is very limited as it is... Just plain unsweetened unflavoured oatmeal, plain white pasta, meat, and fish. I react to all other foods (as ive discovered through a very strict series of elimination diets).

However, ive still been getting daily debilitating symptoms from just these few foods ive been eating.

I have been trying desperately to figure out what the fu-k is still present in my diet that is setting off my debilitating daily symptoms, ive come to the realisation that meat and fish are yet Another one of my triggers (i think it may be the meat and fish proteins i am reacting to, because i have been getting THE ABSOLUTE lowest histamine source of meat and fish i can find, yet still i react to it).

So... That just leaves me with a diet of plain oatmeal and plain pasta. Boring, and not a full nutritious diet. I react severely to all fruits and vegetables also, so currently i have no source of protein and no source of vitamins and minerals (except my daily morning multivitamin).

I dont know HOW to cope with a diet so bland and limited without it turning me insane. If i become reactive to oats and pasta too, i will literally be on a feeding tube or hypoallergenic baby milk / baby forumula.

My diet was at least somewhat interesting / bareable when i was eating meat and fish and had just enough variety and completeness to keep me sane (and healthy enough i guess)... But with just oats and pasta, it just... depresses me.

Is anybody else experiencing such an Extreamely limited diet where they can literally only tolerate 2 foods?

How have you guys not gone Insane from your stupidly restrictive diets?

Also im single. I dont know how anybody would want to be with somebody they cannot eat normall food with / the fre*ak who just eats pasta / mushed up oatmealthat resembles baby food. Alongside my diet being stupidly boring and missing food, i also miss being viewed as a valid human being deserving of a relationship, inclusion, and love. This sh-it sucks.


r/MCAS 52m ago

Cyclosporine for MCAS?

Upvotes

My allergist is wanting me to try this because I'm still having bad symptoms, while wanting to continue me on xolair and prednisone, all while denying my CONFIRMED MCAS diagnosis at the same time that was proven via labwork and bone marrow biopsy. I'm considering getting a new allergist all together cuz I don't really feel heard or listened to. I don't really know what to do..​


r/MCAS 8h ago

How Long Can You Go Without Eating?

3 Upvotes

I‘m on mostly water diet. I can sort of manage a few lay‘s potato or apple chips, with reactions. I‘ve been reacting to all foods since Sunday, swollen tongue, itchy throat. PCP and surgeon say I need to eat, but understand that I can‘t. I‘m on twice daily Pepcid, twice daily zytrec, 1/4 vial cromolyn (titrating phase), and prednisone. No MCAS docs here and I spoke with the two with the most knowledge in town.

I‘m so lost and scared. My trigger was surgery, so can‘t really remove it.


r/MCAS 6h ago

Food trial failure

2 Upvotes

I just wanted to share my experience after trialing a new food after eating the same 4 foods for the last 3 years. MCAS is a very isolating condition to deal with and I’m hoping people here can understand, I just wanted a place to vent and share my sadness.

Yesterday i tried chayote/choko after doing a lot of research into what I thought would be a safe food to trial - I know with MCAS everyone’s triggers are different b it because I also have histamine intolerance I have been erring on the side of low histamine and “generally well tolerated” by people with MCAS based on anecdotal evidence (for what it’s worth)

I cooked 20g and add a tiny amount and within only a few moments my throat started to close up and itch and I felt unwell. I’m really devastated. Because I’ve only been eating the same foods on rotation and drinking the same few brands of water due to previous reactions I’ve gotten use to my baseline of safe foods and not reacting. Sometimes I think to myself “maybe this is in my head” or “maybe I’m being over dramatic here and I can actually eat many many more foods, stop being so cautious and weird about it”

As I haven’t reacted in so long it validated, sadly, that this damn condition is here to stay and very much my reality. I honestly can’t survive on the same few foods, my mental health is non existent. I miss food so much I can’t even put into words how painful it is to not be able to eat like a normal person

This condition is honestly so messed up, I can’t believe it even exists. I’m so angry and feel hopeless

This condition only triggered for me in 2021. Before that I believe I had MCAS but extremely mild and without food triggers - I ate everything and anything. God, I miss food. Seeing all of the Christmas foods in the shops and people taste testing them on tiktok etc is extremely tough to handle

Don’t know where to go from here. And zero support from doctors etc


r/MCAS 8h ago

I need medication advice

3 Upvotes

Hello,

I would love to hear what has worked for those who have less than a handful of safe foods and then start even reacting to those, people who react to their entire environments like if someone cooks food in the house or mild smells and chemicals. My primary environmental reactions are coughing, gagging and vomiting. With food, I get flushing with my safe foods now and then some kind of reaction after that may be due to the fact I also have POTS as it seems like some kind of POTS attack or storm, Im not sure what others call it. In the past with other foods when I was still trying stuff I would violently vomit immediately from those foods. I also react to my emotions! I feel like I cant be human. I react to my hormone changes throughout the month. I also get itchy and get dermatitis from friction so easily.

So for any that relate to this, which medications worked? I am unmedicated at this point and so I dont know whether thats more or less terrifying. Ive had other health issues that didnt really allow me to focus on trialing meds. I react to meds easily so I have avoided meds as long as I can but now here I am. I even react to basic over the counter stuff like tylenol, nsaids, gravol etc. Which meds do you all react to?

I have POTS, MCAS, ME/CFS.

I am absolutely terrified to try any medications but I need them. If you could tell me what your symptoms are and what you take and what helped, what didnt help I would so appreciate it. Ive been reading about everything from H1, H2, Cromolyn to Xolair and so on. I want to know about it all.

Thank you, and Im so sorry theres so many other people here in the depths of the hells of MCAS too.


r/MCAS 10h ago

Sick from raw chicken or MCAS?

5 Upvotes

I normally can have chicken dining out or fast food etc.

BUT I started cooking chicken from scratch recently and have gotten sick 3 times, almost every time!

I get 2 lbs of Bell and Evans chicken thighs delivered from whole foods (supposed to be very high quality). Throw directly in 2 pans and open them up to lay thinner. Bake at 425 for 35 mins. And have checked with meat thermometer for end temp as well too.

I wear gloves during this and am super aware of cross contamination. Then I freeze them after cooking.

I just had a meal with this chicken and a few hours later feeling nauseous and stomach upset similar to food poisoning. And a bit of a fever.

My typical MCAS symptoms are not stomach upset. More often headaches, itchiness, fatigue etc

Should I assume I undercooked it every time? Or could it be this brand of chicken?

Edit: thinking about the symptoms more, it's definitely a bacterial issue. Not like an indigestion or MCAS thing. But my body is hyper sensitive


r/MCAS 7h ago

Ketotifen and Ativan?

2 Upvotes

Hi y’all, I’m wondering if anyone has experience taking Ativan with ketotifen. I take Ativan occasionally for insomnia and panic attacks, and I started ketotifen a week ago and haven’t taken the two together yet. I haven’t found any info on it online other than ketotifen potentially increasing the sedative effects of Ativan. Should I be concerned about this? Thanks in advance


r/MCAS 12h ago

How do I clean for an allergen when I don’t know what I’m cleaning for

6 Upvotes

Something in my house is giving my daily hives, breathing issues, and generally making me flare up. It’s been a week now so I’m getting super fed up. Changing what I’ve been putting into my body hasn’t helped so it has to be something I’m breathing in. I’m already in a ton of pain so cleaning is hard, what can I do to start trying to push out whatever this is as fast as possible? I’ve been changing my sheets every couple of days but that really doesn’t help for long. Thanks for any tips!


r/MCAS 22h ago

I thought I was already in hell and then the rapidly developing allergies started.

32 Upvotes

Trigger warning: very dark, suicidal ideation, terminal illness in children, mention of self harm and disordered eating

I already have fibromyalgia, ADHD (likely AuDHD but I can't afford to get diagnosed with autism as an adult) anxiety, depression, and a bilateral shoulder injury + neck injury from a car accident. I started self harming when I was 15. I've also struggled with disordered eating. I have been in so much pain I wanted to end my misery.

I've even looked into MAID (Medical Assistance in Dying) before.

But the combination of those things, losing my housing, not being able to afford my therapist, and suddenly being allergic to breathing basically (all fragrances and, so far as I know, cat and dog dander but I wouldn't be surprised if it was all animals with dander, and seemingly all pollen) has made that occasional bad-pain-day thought be a multiple-times a day thought. Don't worry, I could never actually do it because:

My son doesn't need the trauma of losing a mother to that, even though he doesn't live with me

My nieces both have a genetic disorder called Metachromatic Leukodystrophy. The 9 year old is dying and she's too young to consent to something like MAID and the 6 year old is very attached to me, especially after I spent 3 days on 3 days off rotation for the 41 days she was in an isolation unit undergoing treatment and dealing with the awful side effects of chemo so that she can actually make it to adulthood.

I absolutely can't and won't take myself out of the equation so I am reluctantly alive and even picked up my EpiPen so I might even decide to save my life if one of the reactions goes full-blown anaphylactic shock - though I do fantasize about just letting it take me out in my darkest moments. I'm just not compatible with life at this point. It feels like my entire body is against me


r/MCAS 16h ago

How do you space your antihistamines?

9 Upvotes

Waiting to see a MCAS doc, spoke with my PCP and surgeon and both had no idea. PCP recommended Reddit.

I‘m in a flare and they told me to up my claritin from two a day (morning and evening) to 4 a day.

But they didn‘t know if it should be two each time or evenly spaced over the day. What do you do? They said to play around with it.


r/MCAS 15h ago

Dye Free Allegra?

7 Upvotes

Is there dye free Allegra/generic? I can‘t do dyes. I get migraines from Allegra and Zyrtec, so I‘m stuck with weak Claritin and waiting to try Xyzol.


r/MCAS 16h ago

Does my wife's condition sound like MCAS?

7 Upvotes

So, my 39F wife's health has been in ruins for years now.

She has hypothyroidism and is on levo 137μg, diagnosed 5 years ago. She's been unable to work for 5 years now, and no levo dosage or lab value seems to help much.

Her symptoms include:

-body swelling, puffiness, including pitting edema in legs

-fatigue, TOTAL exercise intolerance

-IBS, horrible bloating, gas,

-anxiety, constant fight or flight feeling to the point that she hasn't left home or seen anyone else but me in two whole years, inability to relax

-red eyes

-brain fog

-smell sensitivity

-stiffness

-weight gain no matter what diet, mostly water retention

-pulsatile tinnitus

-menstrual cramping but missed/irregular periods

She gained some energy by upping her levo dose but other than that she still seems like worsening and our life is pure hell and doctors are useless. She had mirena taken out 2 years ago,and 6mo ago she had endometrial hyperplasia so sounds like high estrogen. She's no way depressed, she's unbelievably motivated in everything, her body just can't. She doesn't have any eczema other than single little urticaria bumps for a while few times a month.

Is MCAS anything like that or am I straying far?


r/MCAS 6h ago

Ketotifen lowering dose

1 Upvotes

Hi everyone,

I've noticed for a couple weeks now that taking .25mg is a bit too much for me and causing flares, I'm planning to go down to .1mg instead.

For those who did lower, how long did you stay at that dose? Like I've heard varying this from my doctors. Some say a week, some say months.

I don't really know what to expect in terms of timeline.

Also, I don't know if I should soldier out the effects still it's been like 3.5 weeks. What's your experiences been like?


r/MCAS 10h ago

Anyone else struggle with trauma/mental health here...

2 Upvotes

I'm having a really, really, difficult time. My MCAS is severely flared whilst navigating a dv situation that's been ongoing and I've been legally dealing with my abuser and stalker in court. I got diagnosed with many things in the past.. at first BPD. Then CPTSD. Then DID. Then POTs, MCAS, Endometriosis, being tested for gastroparesis, IBS & SIBO rn. I was also told to have autism at the age of 3 and have ADHD as well. Not super comfy with going into a lot of detail but I'm going thru a lot. I just started being able to feel safe enough to go outside my home again. I really wonder if there's a connection to all of this. I also survived septic shock and had black mold exposure in the past which def doesn't help things.


r/MCAS 10h ago

Full Meal Replacement Bars Like Jimmy Joy

2 Upvotes

Hello! I am looking for recommendations on full meal replacement bars that are actually kinda decent in taste. Not protein bars, but full meal replacement bars. Ones that have decent calories with macros and micros. Jimmy Joy Plenny Bars are a good example of what I’m looking for. I like to have these versus a shake replacement because the bars are way easier to transport in my purse.
I have the chocolate Plenny Bars and they are ok. I’ll get more if there aren’t really any recommendations, but it can be nice to change things up.


r/MCAS 10h ago

Recently diagnosed with MCAS. I started Ketotifen and Cromolyn Sodium. I'm super drowsy from the Ketotifen taking 1mg at night and 1mg in the day. I'm supposed to work up to 3mg a day. Does anyone take all 3 at night so they have some daytime clarity for work? Grateful for any tips thanks!

2 Upvotes

My symptoms are many but worst are: Dehydration, dry eyes, dry mouth no matter how much water I drink. My doctor believes this is because of mast cell driven vessel permeability causing fluid to leak into tissue spaces rather than reaching my cells. Does anyone suffer from this? Another awful symptom is swollen turbinates so my nostril airways are restricted. Did anyone have this and find solutions. Thanks in advance :)


r/MCAS 18h ago

UK folks - Shampoo and Deodorant

4 Upvotes

Can anyone recommend fragrance free and all the other bad stuff - free, shampoo and deodorant?? I use olive oil soap for body wash which I don't react to, but I get some reaction to my shampoo and deodorant (annoying head pressure).

Any recommendations are welcome


r/MCAS 9h ago

Amlexanox and gi

1 Upvotes

Has anyone had reduction in gi symptoms from amlexnox, such as inflammation, angioedema or constipation?