The 20 Best Mast Cell Activation Syndrome (MCAS) Doctors Near Me in Ontario, CA

Find the Top Mast Cell Activation Syndrome (MCAS) Experts and Specialists

Last Updated: 04/28/2026

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MediFind found 19 doctor with experience in Mast Cell Activation Syndrome (MCAS) near Ontario, CA. Of these, 16 are Experienced and 3 are Advanced.

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19 providers found
    Advanced in Mast Cell Activation Syndrome (MCAS)

    Lisa K. Hicks
    Advanced in Mast Cell Activation Syndrome (MCAS)

    Lisa K. Hicks
    St. Michael's Hospital, Unity Health Toronto, 
    Toronto, ON, CA 

    Lisa Hicks practices practicing medicine in Toronto, Canada. Ms. Hicks is rated as an Advanced expert by MediFind in the treatment of Mast Cell Activation Syndrome (MCAS). She is also highly rated in 5 other conditions, according to our data. Her clinical expertise encompasses Hepatitis B, Systemic Mastocytosis, Mast Cell Activation Syndrome (MCAS), Splenectomy, and Bone Marrow Transplant.

    Advanced in Mast Cell Activation Syndrome (MCAS)

    Martina A. Trinkaus
    Advanced in Mast Cell Activation Syndrome (MCAS)

    Martina A. Trinkaus
    St. Michael's Hospital/Unity Health Toronto, 
    Toronto, ON, CA 

    Martina Trinkaus practices practicing medicine in Toronto, Canada. Ms. Trinkaus is rated as an Advanced expert by MediFind in the treatment of Mast Cell Activation Syndrome (MCAS). She is also highly rated in 2 other conditions, according to our data. Her clinical expertise encompasses Systemic Mastocytosis, Mast Cell Activation Syndrome (MCAS), Anaphylaxis, Hairy Cell Leukemia (HCL), and Splenectomy.

    Advanced in Mast Cell Activation Syndrome (MCAS)

    Aliyah D. King
    Advanced in Mast Cell Activation Syndrome (MCAS)

    Aliyah D. King
    Ottawa, ON, CA 

    Aliyah King practices practicing medicine in Ottawa, Canada. Ms. King is rated as an Advanced expert by MediFind in the treatment of Mast Cell Activation Syndrome (MCAS). She is also highly rated in 2 other conditions, according to our data. Her clinical expertise encompasses Sunburn, Mast Cell Activation Syndrome (MCAS), Urticaria Pigmentosa, and Muir-Torre Syndrome.

    Learn about our expert tiers
    Experienced in Mast Cell Activation Syndrome (MCAS)

    Anne K. Ellis
    Experienced in Mast Cell Activation Syndrome (MCAS)

    Anne K. Ellis
    Kingston, ON, CA 

    Anne Ellis practices practicing medicine in Kingston, Canada. Ms. Ellis is rated as an Experienced expert by MediFind in the treatment of Mast Cell Activation Syndrome (MCAS). She is also highly rated in 10 other conditions, according to our data. Her clinical expertise encompasses Allergic Rhinitis, Grass Allergy, Anaphylaxis, and Giant Papillary Conjunctivitis.

    Experienced in Mast Cell Activation Syndrome (MCAS)

    Stephanie G. Lee
    Experienced in Mast Cell Activation Syndrome (MCAS)

    Stephanie G. Lee
    St. Michael's Hospital/Unity Health Toronto, 
    Toronto, ON, CA 

    Stephanie Lee practices practicing medicine in Toronto, Canada. Ms. Lee is rated as an Experienced expert by MediFind in the treatment of Mast Cell Activation Syndrome (MCAS). Her clinical expertise encompasses Acute Kidney Failure, Systemic Mastocytosis, Mast Cell Activation Syndrome (MCAS), and Nevoid Basal Cell Carcinoma Syndrome.

    Experienced in Mast Cell Activation Syndrome (MCAS)

    Jason N. Berman
    Experienced in Mast Cell Activation Syndrome (MCAS)

    Jason N. Berman
    Ottawa, ON, CA 

    Jason Berman practices practicing medicine in Ottawa, Canada. Mr. Berman is rated as an Experienced expert by MediFind in the treatment of Mast Cell Activation Syndrome (MCAS). He is also highly rated in 10 other conditions, according to our data. His clinical expertise encompasses Li-Fraumeni Syndrome, Dyskeratosis Congenita, CHARGE Syndrome, and Down Syndrome.

    Experienced in Mast Cell Activation Syndrome (MCAS)

    Susan Waserman
    Experienced in Mast Cell Activation Syndrome (MCAS)

    Susan Waserman
    Hamilton, ON, CA 

    Susan Waserman practices practicing medicine in Hamilton, Canada. Ms. Waserman is rated as an Experienced expert by MediFind in the treatment of Mast Cell Activation Syndrome (MCAS). She is also highly rated in 12 other conditions, according to our data. Her clinical expertise encompasses Anaphylaxis, Allergic Rhinitis, Asthma, and Hives.

    Experienced in Mast Cell Activation Syndrome (MCAS)

    Erika Y. Lee
    Experienced in Mast Cell Activation Syndrome (MCAS)

    Erika Y. Lee
    Toronto, ON, CA 

    Erika Lee practices practicing medicine in Toronto, Canada. Ms. Lee is rated as an Experienced expert by MediFind in the treatment of Mast Cell Activation Syndrome (MCAS). She is also highly rated in 2 other conditions, according to our data. Her clinical expertise encompasses Hives, Anaphylaxis, Localized Scleroderma, and Hereditary Angioedema.

    Experienced in Mast Cell Activation Syndrome (MCAS)

    Zhaodong Xu
    Experienced in Mast Cell Activation Syndrome (MCAS)

    Zhaodong Xu
    501 Smyth Road, K1H 8L6, 
    Ottawa, ON, CA 

    Zhaodong Xu practices practicing medicine in Ottawa, Canada. Xu is rated as an Experienced expert by MediFind in the treatment of Mast Cell Activation Syndrome (MCAS). They are also highly rated in 2 other conditions, according to our data. Their clinical expertise encompasses Chromosome 7p Deletion, Myelodysplastic Syndrome (MDS), Leukemia, and Histiocytosis.

    Experienced in Mast Cell Activation Syndrome (MCAS)

    Sergey V. Prykhozhij
    Experienced in Mast Cell Activation Syndrome (MCAS)

    Sergey V. Prykhozhij
    Ottawa, ON, CA 

    Sergey Prykhozhij practices practicing medicine in Ottawa, Canada. Mr. Prykhozhij is rated as an Experienced expert by MediFind in the treatment of Mast Cell Activation Syndrome (MCAS). He is also highly rated in 4 other conditions, according to our data. His clinical expertise encompasses Leukoplakia, CHARGE Syndrome, Li-Fraumeni Syndrome, and Dyskeratosis Congenita.

    Experienced in Mast Cell Activation Syndrome (MCAS)

    Tugce B. Balci
    Experienced in Mast Cell Activation Syndrome (MCAS)

    Tugce B. Balci
    London, ON, CA 

    Tugce Balci practices practicing medicine in London, Canada. Balci is rated as an Experienced expert by MediFind in the treatment of Mast Cell Activation Syndrome (MCAS). They are also highly rated in 1 other condition, according to our data. Their clinical expertise encompasses CHARGE Syndrome, Ganglioneuroblastoma, Ruvalcaba Syndrome, and Bannayan-Riley-Ruvalcaba Syndrome.

    Experienced in Mast Cell Activation Syndrome (MCAS)

    Amanda Jagdis
    Experienced in Mast Cell Activation Syndrome (MCAS)

    Amanda Jagdis
    Toronto, ON, CA 

    Amanda Jagdis practices practicing medicine in Toronto, Canada. Ms. Jagdis is rated as an Experienced expert by MediFind in the treatment of Mast Cell Activation Syndrome (MCAS). Her clinical expertise encompasses Anaphylaxis, Nasopharyngeal Carcinoma, Mast Cell Activation Syndrome (MCAS), and Asthma.

    Experienced in Mast Cell Activation Syndrome (MCAS)

    Sameer Shivji
    Experienced in Mast Cell Activation Syndrome (MCAS)

    Sameer Shivji
    Mount Sinai Hospital, 600 University Ave, 
    Toronto, ON, CA 

    Sameer Shivji practices practicing medicine in Toronto, Canada. Mr. Shivji is rated as an Experienced expert by MediFind in the treatment of Mast Cell Activation Syndrome (MCAS). He is also highly rated in 1 other condition, according to our data. His clinical expertise encompasses Colorectal Cancer, Atresia of Small Intestine, Pulmonary Alveolar Proteinosis, and Mast Cell Activation Syndrome (MCAS).

    Experienced in Mast Cell Activation Syndrome (MCAS)

    Baruch D. Jakubovic
    Experienced in Mast Cell Activation Syndrome (MCAS)

    Baruch D. Jakubovic

    Humber River Hospital

    Toronto, ON, CA 

    Baruch Jakubovic practices practicing medicine in Toronto, Canada. Mr. Jakubovic is rated as an Experienced expert by MediFind in the treatment of Mast Cell Activation Syndrome (MCAS). His clinical expertise encompasses Anaphylaxis, Systemic Mastocytosis, Hives, and Mast Cell Activation Syndrome (MCAS).

    Experienced in Mast Cell Activation Syndrome (MCAS)

    Jose-mario Chichi-Capo
    Experienced in Mast Cell Activation Syndrome (MCAS)

    Jose-mario Chichi-Capo
    Toronto, ON, CA 

    Jose-mario Chichi-Capo practices practicing medicine in Toronto, Canada. Chichi-Capo is rated as an Experienced expert by MediFind in the treatment of Mast Cell Activation Syndrome (MCAS). They are also highly rated in 2 other conditions, according to our data. Their clinical expertise encompasses Acute Myeloid Leukemia (AML), Leukemia, Myelofibrosis, and West Syndrome.

    Experienced in Mast Cell Activation Syndrome (MCAS)

    Signy Chow
    Experienced in Mast Cell Activation Syndrome (MCAS)

    Signy Chow
    Toronto, ON, CA 

    Signy Chow practices practicing medicine in Toronto, Canada. Ms. Chow is rated as an Experienced expert by MediFind in the treatment of Mast Cell Activation Syndrome (MCAS). Her clinical expertise encompasses Chronic Demyelinizing Neuropathy with IgM Monoclonal, RUNX1 Familial Platelet Disorder, Waldenstrom Macroglobulinemia, Multiple Myeloma, and Bone Marrow Transplant.

    Experienced in Mast Cell Activation Syndrome (MCAS)

    Paul Plantinga
    Experienced in Mast Cell Activation Syndrome (MCAS)

    Paul Plantinga
    Department Of Otolaryngology Head And Neck Surgery, 
    London, ON, CA 

    Paul Plantinga practices practicing medicine in London, Canada. Mr. Plantinga is rated as an Experienced expert by MediFind in the treatment of Mast Cell Activation Syndrome (MCAS). He is also highly rated in 1 other condition, according to our data. His clinical expertise encompasses Angiosarcoma of the Liver, Head and Neck Squamous Cell Carcinoma (HNSCC), Angiosarcoma, and PIK3CA-Related Overgrowth Spectrum.

    Experienced in Mast Cell Activation Syndrome (MCAS)

    Vinothkumar Rajan
    Experienced in Mast Cell Activation Syndrome (MCAS)

    Vinothkumar Rajan
    Toronto, ON, CA 

    Vinothkumar Rajan practices practicing medicine in Toronto, Canada. Rajan is rated as an Experienced expert by MediFind in the treatment of Mast Cell Activation Syndrome (MCAS). Their clinical expertise encompasses Leukemia, Acute Myeloid Leukemia (AML), and Mast Cell Activation Syndrome (MCAS).

    Experienced in Mast Cell Activation Syndrome (MCAS)

    Kieran L. Quinn
    Experienced in Mast Cell Activation Syndrome (MCAS)

    Kieran L. Quinn
    Toronto, ON, CA 

    Kieran Quinn practices practicing medicine in Toronto, Canada. Mr. Quinn is rated as an Experienced expert by MediFind in the treatment of Mast Cell Activation Syndrome (MCAS). He is also highly rated in 3 other conditions, according to our data. His clinical expertise encompasses Long Haul COVID, Severe Acute Respiratory Syndrome (SARS), COVID-19, and Heart Failure.

    While we make every effort to provide the best results possible, data is currently limited outside of the United States. Doctors listed may include both clinicians and researchers, and individuals relocate frequently. We recommend contacting doctors directly to confirm their location and areas of focus. Contact information is provided when available. Learn more about our expert tiers.
    Showing 1-19 of 19

    Last Updated: 04/28/2026

    What is the definition of Mast Cell Activation Syndrome (MCAS)?

    Mast cell activation syndrome (MCAS) causes a person to have repeated severe allergy symptoms affecting several body systems. In MCAS, mast cells mistakenly release too many chemical agents, resulting in symptoms in the skin, gastrointestinal tract, heart, respiratory, and neurologic systems. Mast cells are present throughout most of our bodies and secrete different chemicals during allergic reactions. Symptoms include episodes of abdominal pain, cramping, diarrhea, flushing, itching, wheezing, coughing, lightheadedness and rapid pulse and low blood pressure. Symptoms can start at any age, but usually begin in adulthood. The cause of MCAS is unknown. Diagnosis is based on the symptoms, clinical exam, and specific laboratory testing. Other conditions may need to be excluded before MCAS can be diagnosed.

    When should I see a Mast Cell Activation Syndrome (MCAS) doctor in Ontario, CA?

    There are various reasons why you may want to see a specialist, such as: 

    • Your primary care provider recommends it. 
    • Your condition requires expert knowledge and specialized care. 
    • Your symptoms persist or worsen despite treatment. 
    • You need specialized testing or procedures. 
    • You want a second opinion.  

    What should I consider when choosing a Mast Cell Activation Syndrome (MCAS) doctor in Ontario, CA?

    It’s important to see a provider with expertise in your specific condition. Each provider profile in MediFind’s doctor database includes information on which conditions they treat, years of experience, research contributions, languages spoken, insurance plans accepted, and more.  

    How do I find the best Mast Cell Activation Syndrome (MCAS) doctor in Ontario, CA?

    You can find a Mast Cell Activation Syndrome (MCAS) doctor in any of the 10 largest U.S. cities by clicking below:

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    How does MediFind rank Mast Cell Activation Syndrome (MCAS) doctors in Ontario, CA?

    MediFind’s rankings are based on a variety of data sources, such as the number of articles a doctor has published in medical journals, participation in clinical trials and industry conferences, as well as the number of patients that provider sees for a given condition. Note that MediFind’s provider database is not based on user reviews, and providers do not pay to be included in the database. 

    What types of insurance are accepted by Mast Cell Activation Syndrome (MCAS) doctors in Ontario, CA?

    Most profiles in MediFind’s doctor database include a list of insurance plans accepted by that provider. However, it’s a good idea to contact the provider’s office to make sure they still accept your insurance, then doublecheck by contacting your insurance plan to confirm they’re in network. 

    How can I book an appointment online with a Mast Cell Activation Syndrome (MCAS) doctor in Ontario, CA?

    MediFind offers direct scheduling for certain providers using the “Request Appointment” button on that provider’s profile. If the schedule option is not available for a provider, tap the red “Show Phone Number” button on their profile to get their contact information. If you prefer to find providers who offer online scheduling, select “Schedules online” under the “Availability” category of the filter feature on the left side of the Mast Cell Activation Syndrome (MCAS) doctor search results page. 

    Why is it important to get a second opinion from a different Mast Cell Activation Syndrome (MCAS) doctor?

    Second opinions are an opportunity to confirm a diagnosis and its root cause, learn about alternative treatment options, or simply gain peace of mind. Many people, especially those with serious diagnoses, get second opinions so they can understand all their options and make informed decisions, so don’t hesitate to get one if you have any doubts or need more information or clarification regarding your care. Note that some insurance plans require second opinions, while others don’t cover second opinions, so be sure to confirm with your insurance provider first.   

    How can I prepare for my appointment with a Mast Cell Activation Syndrome (MCAS) doctor in Ontario, CA?

    Prepare for your appointment by gathering the following items: 

    • Copies of medical records (dating back at least one year) 
    • Your medical history, including illnesses, medical conditions, surgeries, and other doctors you see 
    • Family history of disease 
    • List of current prescription drugs, over-the-counter medicines, vitamins, and herbal remedies or supplements including names and doses 
    • Allergies to medications, food, latex, insects, etc.  
    • List of questions and concerns 
    • Your insurance card 

    You might also contact the provider’s office to see if they offer transportation or childcare services or if you’re allowed to bring a loved one for support or to take notes during your visit. 

    What questions should I ask my Mast Cell Activation Syndrome (MCAS) doctor?

    Here are some sample questions: 

    • Can you explain in simple terms what this condition is and how it’s treated? 
    • What symptoms or side effects should I watch for? 
    • What tests will be involved, and when can I expect results? 
    • Are there other specialists I need to see? 
    • What’s the best way to reach you if I have follow-up questions? 

    How can I learn about the latest clinical trials and research advances my Mast Cell Activation Syndrome (MCAS) doctor may know about?

    MediFind’s Clinical Trials tool asks you a series of questions to help you narrow down your search by health condition, age, gender, location, how far you’re willing to travel, and more. Each question you answer filters down the number of trials until you find the ones that are most relevant to you. 

    MediFind’s Latest Advances tool features summaries of recent articles published in medical journals. We use cutting-edge technology to scour medical publication databases for the latest research advancements on any given condition, then we simplify this information in a way that’s useful and easy to understand. 

    Can I filter my search to show male or female Mast Cell Activation Syndrome (MCAS) doctors in Ontario, CA?

    Look for the filter feature on the left side of the Mast Cell Activation Syndrome (MCAS) doctor search results page. Select “Female” or “Male” under the “Gender” category to search for female or male providers exclusively. If the “Any” option is selected, it will pull results for both male and female providers. 

    Can I filter my search to find a Mast Cell Activation Syndrome (MCAS) doctor that offers video calls?

    Look for the filter feature on the left-side of the Mast Cell Activation Syndrome (MCAS) doctor search results page. Select “Offers telehealth visits” under the Availability category to search for providers who offer virtual appointments (video calls). 

    Reviewed on: 11/11/24  

    By: MediFind Medical Staff 

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