Many people use “allergist” and “immunologist” interchangeably. That’s understandable: in the United States, doctors train in a combined specialty called Allergy and Immunology. But there is a difference in focus.
Allergists primarily treat allergic conditions and asthma. Immunologists focus on broader immune system disorders, such as autoimmune diseases and immune deficiencies. Many doctors do both.
At Heart and Health Medical, we want to make healthcare easy to understand. We know medical words can be confusing for many people.
Below, we will explain the exact difference between an allergist and an immunologist.
What Is an Allergist?
An allergist is a doctor who treats allergies and asthma.
An allergy happens when your immune system overreacts to something that doesn’t bother most people. Common triggers include pollen, dust, pets and certain foods, as well as extreme reactions to bug bites or medicines.
Allergies can cause:
- Sneezing
- Itchy eyes or skin
- A runny nose
- Skin bumps or rashes
- Trouble breathing
- Stomach pain
An allergist may use skin tests or blood tests to find what causes your allergies.
The doctor may give you medicine, allergy shots, or tips to help you stay away from things that cause your symptoms.
Allergists often treat:
- Seasonal allergies, such as hay fever
- Food allergies
- Pet allergies
- Reactions to medicine
- Eczema, a skin problem that causes itching
- Asthma
- Hives, which are itchy bumps on the skin
What Is an Immunologist?
An immunologist studies and treats the immune system. Your immune system is important to defend your body against germs. However, sometimes, it isn’t working as it should.
It may be too weak to fight germs. Or it may attack healthy parts of your body by mistake.
This can lead to health problems.
Immunologists often treat:
- Immune system problems that people are born with
- Weak immune systems caused by illness or medicine
- Autoimmune diseases occur when the body starts to attack other healthy cells
- Infections that happen often or are hard to treat
- Other problems that affect how the immune system works
Key Difference Between an Allergist and an Immunologist
| Allergist | Immunologist |
| Focuses on allergic reactions and related conditions | Focuses on immune system problems |
| Treats hay fever, food allergies and hives | May treat immune deficiency and complex conditions |
| Uses allergy tests when needed | May order tests to assess immune function |
| Helps patients avoid triggers and control symptoms | Helps patients manage immune system conditions |
What Training Do Allergists and an Immunologist Have?
Both allergists and immunologists follow the same training path:
- Four years of medical school
- Three-year residency in internal medicine or pediatrics
- Two- to three-year fellowship in Allergy and Immunology
- Board certification through the American Board of Allergy and Immunology (ABAI)
Because of this combined training, most specialists are trained to treat both allergies and immune system problems.
At Heart and Health Medical, Dr. Louis Guida Jr. is board-certified in allergy and immunology. He can help patients with common allergies, asthma and more complex immune system problems.
When to See an Allergist
Consider seeing an allergist if you have:
- Constant sneezing, runny nose, or itchy eyes
- Trouble breathing or wheezing
- Recurring rashes or hives
- Stomach problems after eating certain foods
- Reactions to insect stings or medicines
If allergies interfere with daily life, an allergist can identify triggers and build a treatment plan.
When to See an Immunologist
Consider seeing an immunologist if you have:
- Infections that happen often or don’t go away
- A family history of immune disorders
- Symptoms that suggest an autoimmune disease
- Medical problems other doctors haven’t been able to diagnose
An immunologist will run special blood tests. They will look deep into your cells to find the problem. Heart and Health Medical offers on-site Blood Draw Services to make this testing very simple for you.
Is an Allergist Better Than an Immunologist?
No. One doctor is not better than the other. They actually study the same things in medical school. In the United States, doctors train in a combined program. It is called “Allergy and Immunology.”
This means your doctor is an expert in both areas. However, doctors often pick a favorite area.
Some doctors spend all day helping people with seasonal sniffles. They call themselves allergists. Other doctors spend all day in the hospital treating rare diseases. They call themselves immunologists.
The best doctor for you depends on what is making you sick.
How Do I Find the Right Doctor?
Start with your primary care doctor. They can help decide if you need a specialist. If your symptoms are mainly allergy-related, ask for an allergist. If you have unusual infections or suspected immune problems, ask for an immunologist.
If you’re in Long Island, New York, Heart and Health Medical offers board-certified Allergy and Immunology specialists. You can use our website or our mobile app to book an appointment.
Our wonderful team is ready to listen to you. At Heart and Health Medical, we truly put our heart into your health.
FAQs
Can an allergist treat immune deficiencies?
Yes. Many allergists are also immunologists. They learn how to diagnose and treat blood tests and customized treatment plans to address immune deficiencies.
Do I require a referral to an allergist?
This will depend on the insurance coverage that you have. Several plans will require a referral from your main care physician, while others will permit scheduling. Our doctors at Heart and Health Medical work together to ensure your treatment is hassle-free.
What happens during an allergy test?
An allergist places a small drop of the allergen on your skin, and then gently scratches your skin. If you’re allergic, you’ll develop a small, itchy red bump within 15–20 minutes. The test is quick and safe.
Can children see an allergist or immunologist?
Yes. Pediatric allergists and immunologists are trained to care for babies, children and teens. They can make young patients feel comfortable.