Please note: Ready Health does not engage an immunologist. Our clinicians have helped many patients start to understand their symptoms and reduce their histamine levels to improve the quality of their lives. We are very happy to see patients who think that they may have these conditions, as there seems to be a distinct absence of understanding of the condition currently.
Mast Cell Activation Syndrome Consultation
Specialist private assessment for MCAS and histamine-driven conditions. A 45-minute initial consultation (£149) followed by a 30-minute review around 4 weeks later (£119, prescriptions included) — online by video UK-wide, or face to face at our Standish, Wigan clinic.
Initial MCAS Consultation
- Full symptom history & trigger review
- Tailored medication plan
- Low-histamine dietary guidance
- Private prescription issued if appropriate
- Written follow-up summary
MCAS consultations at Ready Health — at a glance
Ready Health provides private Mast Cell Activation Syndrome (MCAS) consultations from its CQC-registered clinic in Standish, Wigan. The initial consultation is £149 for a 45-minute appointment, and a follow-up around 4 weeks later is £119 for 30 minutes — both fees include any private prescriptions written. Appointments are available online by video across the UK or face to face: to be seen in person, simply book a face-to-face specific appointment in the booking window. No GP referral is needed.
What is Mast Cell Activation Syndrome?
A chronic, multi-system condition where mast cells — part of your immune system — release mediators inappropriately, producing allergic-type symptoms without a clear cause.
Mast cells are specialist immune cells that store granules of histamine, heparin, tryptase, prostaglandins, leukotrienes and many other chemical mediators. They are designed to release these substances when your body encounters a genuine threat such as a virus, bacterium, or injury.
In Mast Cell Activation Syndrome (MCAS), mast cells become chronically over-reactive and release excessive amounts of these mediators in response to ordinary, harmless stimuli — or sometimes with no identifiable trigger at all. Because mast cells are present throughout the body, symptoms can occur anywhere: skin, gut, lungs, cardiovascular system, nervous system, and beyond.
MCAS frequently overlaps with Histamine Intolerance (HIT), Postural Tachycardia Syndrome (PoTS), Hypermobility Spectrum Disorders / hEDS, Long COVID, ME/CFS, and Fibromyalgia. Around one in five people with histamine intolerance also have MCAS, and will not respond fully to diet and antihistamines alone — they will usually need a mast cell stabilising medication as well.
There is no permanent cure, but with careful assessment, trigger identification, and a tailored medication plan, most patients experience meaningful improvement in symptoms and quality of life. We provide honest, practical guidance rooted in the best available UK clinical evidence — read our in-depth guide in our MCAS blog post for further background.
In-depth reading
Read our detailed explainer: Mast Cell Activation Syndrome — a UK patient guide →
MCAS at a glance
A chronic disorder of inappropriate mast cell mediator release, producing symptoms that fluctuate in severity and frequently cross multiple body systems.
Common MCAS symptoms
Because mast cells sit in every tissue of the body, symptoms are diverse, often migratory, and frequently dismissed. Patients typically report episodes that come and go, sometimes daily, sometimes weekly.
Skin
Flushing, hives, itching, dermatographism, angioedema, rashes and unexplained welts.
Cardiovascular
Palpitations, tachycardia, low or labile blood pressure, chest tightness, dizziness, syncope.
Neurological
Brain fog, migraines, headaches, anxiety, insomnia, paraesthesia, cognitive dysfunction.
Gastrointestinal
Abdominal pain, bloating, nausea, reflux, diarrhoea or constipation, food reactions, IBS-like symptoms.
Respiratory
Nasal congestion, sneezing, throat tightness, wheezing, shortness of breath, chronic cough.
Systemic
Profound fatigue, malaise, temperature intolerance, unexplained weight change, chronic inflammation.
Musculoskeletal
Joint pain, muscle aches, bone pain, generalised stiffness, exercise intolerance.
Allergic / Anaphylactoid
Reactions to foods, drugs, insect stings, fragrances or with no identifiable trigger at all.
Common MCAS triggers
Avoiding triggers is the essential first step in MCAS management. During your consultation we help you build a personalised trigger profile across all of these categories.
High-histamine and histamine-liberating foods
A strict low-histamine diet for four weeks is typically recommended to assess benefit. Useful classifications include the SIGHI (Swiss Interest Group Histamine Intolerance) food list — foods graded 2 and 3 should be avoided first, with H1 and L1 foods removed if needed.
- Fermented foods: aged cheese, sauerkraut, kombucha, soy sauce, vinegar
- Alcohol (particularly red wine, champagne, beer)
- Cured and smoked meats, tinned fish, leftovers older than 24 hours
- Tomatoes, aubergine, spinach, avocado, strawberries, citrus
- Chocolate, cocoa, caffeine, artificial additives
- Histamine liberators: shellfish, pineapple, papaya, nuts, wheat
Environmental triggers
- Temperature extremes — cold, heat, rapid changes
- UV light and prolonged sun exposure
- Strong scents, perfumes, cleaning products, smoke
- Mould, dust, pollen, pet dander
- Chemical exposures, including pharmaceutical excipients
- Pressure and friction on the skin (dermatographism)
Medications that can interfere with histamine metabolism
Many prescription drugs inhibit diamine oxidase (DAO) and histamine-N-methyltransferase (HNMT), the enzymes that break histamine down. If you tolerate these without obvious adverse effect, there is usually no need to stop them — but your clinician will review them carefully.
- NSAIDs including aspirin and ibuprofen
- Beta-lactam antibiotics (especially amoxicillin) and fluoroquinolones (especially ciprofloxacin)
- Proton pump inhibitors (especially lansoprazole)
- Beta blockers, ACE inhibitors, SSRIs and SNRIs
- Opioids — particularly morphine, codeine, dihydrocodeine, oxycodone and pethidine. Tramadol, fentanyl and buprenorphine have less mast cell effect
- Those sensitive to aspirin should avoid salicylate-containing products including some toothpastes, cosmetics and food preservatives
Lifestyle & physical triggers
- Emotional stress, anxiety, and poor sleep
- Intense or sudden exercise
- Illness, infection, vaccinations
- Surgery and general anaesthesia
- Insect stings and bites
- Dehydration
Hormonal influences
Oestrogen stimulates mast cells and inhibits DAO — so MCAS and histamine intolerance symptoms are often worse around ovulation and before menstruation, and can change significantly during perimenopause, menopause, pregnancy and with hormone therapy.
- Perimenstrual flares (days before and during menses)
- Perimenopausal symptom worsening
- Oestrogen-containing contraceptives and HRT — careful balancing required
- Pregnancy can either improve or worsen symptoms dramatically
Medication options for MCAS
MCAS management follows a stepwise approach. Your clinician will build a tailored plan, typically starting with H1 and H2 antihistamines and adding mast cell stabilisers or other agents as needed. All prescribing decisions are individualised and reviewed at your follow-up appointment.
H1 antihistamines First line
Block histamine H1 receptors and bring clinically significant benefit to most MCAS patients. Frequently required twice daily rather than once.
- Non-sedating: cetirizine, loratadine, fexofenadine
- Sedating: diphenhydramine, chlorphenamine
- Cheap, long-term safe, easy to combine
H2 antihistamines First line
Target gastric and systemic H2 receptors. Usually combined with an H1. Twice-daily dosing is typical in MCAS.
- Famotidine and nizatidine preferred
- Cimetidine has many drug interactions
- Helpful for reflux, GI symptoms, flushing
Mast cell stabilisers Step 2
Prevent mast cell degranulation at the source. Full benefit can take up to 6 months as mast cells turn over.
- Sodium cromoglicate — oral or inhaled
- Ketotifen — H1 antagonist + stabiliser (useful with insomnia)
- Quercetin (OTC) — may be combined with the above
Leukotriene antagonists Step 2
Block leukotriene receptors, another important class of mast cell mediators. Useful where respiratory or inflammatory symptoms dominate.
- Montelukast — typically once daily
- Complements H1/H2 blockade
- Monitored for mood side effects
Supplements & vitamins Adjunct
Several supplements have mast cell stabilising or anti-inflammatory effects and can be useful alongside prescribed medication.
- High-dose vitamin C — reduces histamine release
- High-dose vitamin D — immune modulation
- Quercetin, DAO enzyme supplements
Aspirin & NSAIDs Selective use
Can help some MCAS patients — but may precipitate reactions in a minority. Trial should only ever be under clinical supervision.
- Low-dose aspirin in selected cases
- Avoid if aspirin-sensitive
- Monitor closely for paradoxical reactions
Benzodiazepines Targeted
Have mast cell stabilising effects in addition to their anxiolytic action. Considered carefully where anxiety is a prominent MCAS feature.
- Lorazepam, clonazepam
- Short-term or symptom-triggered use
- Prescribing governance reviewed at each visit
Monoclonal antibodies Specialist
For severe refractory cases. In the UK, omalizumab is only licensed for severe allergic asthma and chronic urticaria and requires specialist referral.
- Omalizumab — anti-IgE
- NHS specialist pathway only
- We can advise on onward referral routes
Brain & ANS retraining Holistic
Neural retraining programmes can significantly reduce symptom burden by calming the autonomic nervous system and dampening threat-response patterns that maintain mast cell activation.
- Structured nervous-system retraining
- Pacing, breath-work, vagal tone
- Complements medication, rarely replaces it
A note on GLP-1 receptor agonists
There is emerging interest in GLP-1 receptor agonists (e.g. semaglutide, tirzepatide) in MCAS, after some patients treated for obesity or type 2 diabetes reported improvement in mast cell symptoms. A 2025 retrospective study by Dr Lawrence Afrin and colleagues reported clinical benefit in 89% of 47 MCAS cases, though most were overweight or obese.
At present there is insufficient evidence to recommend GLP-1 therapy outside its licensed indications of obesity and type 2 diabetes. The appropriate route for patients interested in this approach is enrolment in a clinical trial. We will discuss the evidence honestly during your consultation.
Anaesthesia & surgery in MCAS
If you need surgery, please share your MCAS diagnosis with the anaesthetist. Adrenaline-free local anaesthesia is preferred; H1 antihistamines should typically be doubled for two days before and after surgery; and low-dose naltrexone, if you take it, is usually stopped two days before anaesthesia. We can provide a letter for your surgical team.
How your consultation works
A clear, unhurried pathway designed around patients who have often been through years of missed diagnoses — with a built-in review around 4 weeks after you start treatment.
Book online
Pay the £149 fee at booking. Appointments are available online by video or face to face — simply select the face-to-face appointment option in the booking window.
Pre-consultation
Complete a detailed symptom, trigger and medication questionnaire so your clinician can prepare in advance.
Initial consultation
A thorough 45-minute discussion, examination (if face to face), tailored plan and any appropriate private prescription — included in your fee.
Follow-up at ~4 weeks
A 30-minute review (£119), online or face to face, to assess your response, refine your plan, and write any prescriptions needed — prescription writing included.
Simple, two-step pricing
One fee for your initial assessment, one fee for your follow-up review — both available online by video or face to face at our Standish, Wigan clinic.
What's included
- 45-minute private consultation with a Ready Health clinician
- Full history, symptom review and trigger assessment
- Tailored management and dietary guidance
- Any private prescription we issue is included in the fee
- Written follow-up summary
What's included
- 30-minute review around 4 weeks after your initial appointment
- Assessment of your response to treatment and trigger avoidance
- Adjustments to your medication plan where needed
- Any private prescriptions written are included in the fee
- Ongoing review appointments available thereafter
Book your MCAS consultation
Select a time that suits you. Choose an online video appointment, UK-wide, or a face-to-face appointment at 22 High Street, Standish, Wigan, WN6 0HL.
Prefer to be seen in person? Simply book a face-to-face specific appointment in the booking window below and you'll be seen at our Standish, Wigan clinic. Choose a standard appointment to be seen online by secure video.
MCAS FAQs
MCAS is a clinical diagnosis supported by a pattern of recurrent, multi-system allergic-type symptoms affecting at least two organ systems, objective evidence of mast cell mediator release where possible, and a clear response to mast-cell-targeted treatment. There is no single definitive test. Your clinician will take a detailed history and, where helpful, discuss tests such as serum tryptase or 24-hour urinary histamine metabolites.
The initial MCAS consultation is £149 for a 45-minute appointment, which includes any private prescription we issue. A follow-up appointment, usually around 4 weeks later, is £119 for 30 minutes and includes any private prescriptions written at that appointment. Medication costs are charged separately by the dispensing pharmacy.
Yes. Both the initial consultation and the follow-up can be carried out online by secure video from anywhere in the UK, or face to face at our clinic at 22 High Street, Standish, Wigan WN6 0HL. You choose whichever suits you at the time of booking.
Book through the online booking tool on this page and select the face-to-face specific appointment in the booking window. Your appointment will then take place in person at 22 High Street, Standish, Wigan WN6 0HL. Online video appointments can be selected in the same booking window.
The follow-up takes place around 4 weeks after your initial consultation. It is a 30-minute review, online or face to face, costing £119. Your clinician reviews your response to treatment and trigger avoidance, adjusts your management plan as needed, and writes any private prescriptions required — prescription writing is included in the fee.
No. You can self-refer by booking directly through the booking tool on this page. With your permission we will write to your GP after the consultation.
Most patients start with H1 and H2 antihistamines (e.g. cetirizine or fexofenadine plus famotidine or nizatidine), often twice daily. Depending on response, we may add mast cell stabilisers such as sodium cromoglicate or ketotifen, or a leukotriene antagonist such as montelukast. Supplements such as quercetin, high-dose vitamin C and vitamin D are often adjuncts. All prescribing is individualised.
Some patients notice improvement within days of starting H1/H2 antihistamines and trigger avoidance. Mast cell stabilisers can take up to six months for full effect, as mast cells turn over slowly. MCAS management is usually a stepwise process — which is why we review you at a follow-up appointment around 4 weeks after your initial consultation.
No. Ready Health does not engage an immunologist. Our experienced GMC-registered clinicians have helped many patients begin to understand their symptoms and reduce their histamine levels to improve their quality of life. We welcome patients who suspect they may have MCAS, given the widespread lack of understanding of the condition.
Yes. These conditions commonly overlap with MCAS. We take the overlap seriously and will address it as part of your care plan.
Private clinics do not provide emergency care. If you are having a severe allergic or anaphylactic reaction, call 999 or go to your nearest A&E immediately. Carry any prescribed adrenaline auto-injectors at all times.
Start understanding your symptoms today
Book a private MCAS consultation with Ready Health — £149 initial (45 min), £119 follow-up (30 min, prescriptions included). Online or face to face.
Book Now →