Allergy & Immunology

Allergies are among the most common health concerns. You can be allergic to anything from foods to pets to environmental things like pollen or dust. Allergies are more likely to affect children, but they can start at any age.

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Abdominal wall fat pad biopsy
An abdominal wall fat pad biopsy is the removal of a small part of the abdominal wall fat pad for laboratory study of the tissue. biopsy

Diseases & Conditions
Agammaglobulinemia is an inherited disorder in which a person has very low levels of protective immune system proteins called immunoglobulins. Immunoglobulins are a type of antibody. Low levels of these...

Special Topics
An allergen is a substance that can cause an allergic reaction. In some people, the immune system recognizes allergens as foreign or dangerous. As a result, the immune system reacts by making a type of...

Diseases & Conditions
Allergic conjunctivitis
The conjunctiva is a clear layer of tissue lining the eyelids and covering the white of the eye. Allergic conjunctivitis occurs when the conjunctiva becomes swollen or inflamed due to a reaction to pollen...

Allergic reactions
Allergic reactions are sensitivities to substances called allergens that come into contact with the skin, nose, eyes, respiratory tract, and gastrointestinal tract. They can be breathed into the lungs,...

Diseases & Conditions
Allergic rhinitis
Allergic rhinitis is a diagnosis associated with a group of symptoms affecting the nose. These symptoms occur when you breathe in something you are allergic to, such as dust, animal dander, or pollen. Symptoms...

In-depth Report
Allergic rhinitis
An in-depth report on the causes, diagnosis, treatment, and prevention of common nasal allergies. Nasal allergies can be associated with sinus inflammation and congestion; so the term 'allergic rhinosinusitis...

Questions To Ask Your Doctor
Allergic rhinitis - what to ask your doctor - adult
What to ask your doctor about allergic rhinitis - adult; Hay fever - what to ask your doctor - adult; Allergies - what to ask your doctor - adult; Allergic conjunctivitis - what to ask your doctor

Diseases & Conditions
An allergy is an immune response or reaction to substances that are usually not harmful. immune response

Self-Care Instructions
Allergies, asthma, and dust
Reactive airway disease - dust; Bronchial asthma - dust; Triggers - dust

Self-Care Instructions
Allergies, asthma, and pollen
Reactive airway - pollen; Bronchial asthma - pollen; Triggers - pollen; Allergic rhinitis - pollen

Discharge Instructions
Allergy shots
Allergy injections; Allergen immunotherapy

Allergy testing - skin
Allergy skin tests are used to find out which substances cause a person to have an allergic reaction.

Diseases & Conditions
Anaphylaxis is a life-threatening type of allergic reaction. allergic reaction

Diseases & Conditions
Angioedema is swelling that is similar to hives, but the swelling is under the skin instead of on the surface. hives Hives are often called welts. They are a surface swelling. It is possible to have angioedema...

Special Topics
An antibody is a protein produced by the body's immune system when it detects harmful substances, called antigens. Examples of antigens include microorganisms (bacteria, fungi, parasites, and viruses) and...

Antibody titer blood test
Antibody titer is a laboratory test that measures the level of antibodies in a blood sample. antibodies

Special Topics
An antigen is any substance that causes your immune system to produce antibodies against it. This means your immune system does not recognize the substance, and is trying to fight it off. antibodies An...

Self-Care Instructions
Antihistamines for allergies
Allergic rhinitis - antihistamine; Hives - antihistamine; Allergic conjunctivitis - antihistamine; Urticaria - antihistamine; Dermatitis - antihistamine; Eczema - antihistamine

In-depth Report
Asthma in adults
An in-depth report on how asthma is diagnosed, treated, and managed in adults.

Diseases & Conditions
Asthma in children
Asthma is a disease that causes the airways to swell and get narrow. It leads to wheezing, shortness of breath, chest tightness, and coughing. Asthma

In-depth Report
Asthma in children and adolescents
An in-depth report on how asthma is diagnosed, treated, and managed in children and adolescents.

Special Topics
Autoinoculation is a procedure in which cells are removed from the body, treated or medically changed, and then placed back into the body. It is done to help prevent an immune reaction or to help diagnose...


Clean catch urine sample
A clean catch is a method of collecting a urine sample to be tested. The clean-catch urine method is used to prevent germs from the penis or vagina from getting into a urine sample.


Diseases & Conditions
Drug allergies
Drug allergies are a group of symptoms caused by an allergic reaction to a drug (medicine).


Diseases & Conditions
Food allergy
A food allergy is type of immune response triggered by eggs, peanuts, milk, shellfish or some other specific food.


Diseases & Conditions
Graft-versus-host disease
Graft-versus-host disease (GVHD) is a life-threatening complication that can occur after certain stem cell or bone marrow transplants. bone marrow transplants


Diseases & Conditions
Hereditary angioedema
Hereditary angioedema is a rare but serious problem with the immune system. The problem is passed down through families. It causes swelling, particularly of the face and airways, and abdominal cramping...

Special Topics
A histiocyte is a type of immune cell. It destroys foreign substances to protect the body from infection.

Diseases & Conditions
Hives are raised, often itchy, red bumps (welts) on the surface of the skin. They can be an allergic reaction to food or medicine. They can also appear without cause.

Diseases & Conditions
Hyperimmunization is the presence of a larger than normal number of antibodies to a specific antigen. This creates a state of immunity that is greater than normal. Immune system overactivity can cause many...

Diseases & Conditions
Hyperimmunoglobulin E syndrome
Hyperimmunoglobulin E syndrome is a rare, inherited disease. It causes problems with the skin, sinuses, lungs, bones, and teeth.


Special Topics
Immune response
The immune response is how your body recognizes and defends itself against bacteria, viruses, and substances that appear foreign and harmful.

Diseases & Conditions
Immunodeficiency disorders
Immunodeficiency disorders occur when the body's immune response is reduced or absent. immune response


Special Topics
Lymph system
The lymph system is a network of organs, lymph nodes, lymph ducts, and lymph vessels that make and move lymph from tissues to the bloodstream. The lymph system is a major part of the body's immune system...


Self-Care Instructions
Managing latex allergies at home
Latex products; Latex allergy; Latex sensitivity; Contact dermatitis - latex allergy


Discharge Instructions
Nasal corticosteroid sprays
Steroid nasal sprays; Allergies - nasal corticosteroid sprays

Nitroblue tetrazolium blood test
The nitroblue tetrazolium test checks if certain immune system cells can change a colorless chemical called nitroblue tetrazolium (NBT) into a deep blue color.


Diseases & Conditions
Occupational asthma
Occupational asthma is a lung disorder in which substances found in the workplace cause the airways of the lungs to swell and narrow. This leads to attacks of wheezing, shortness of breath, chest tightness...


Poison ivy - oak - sumac rash
Poison ivy, oak, and sumac are plants that commonly cause an allergic skin reaction. The result is most often an itchy, red rash with bumps or blisters. Poison ivy, oak, and sumac rash


Diseases & Conditions
Serum sickness
Serum sickness is a reaction that is similar to an allergy. The immune system reacts to medicines that contain proteins used to treat immune conditions. It can also react to antiserum, the liquid part of...

A sneeze is a sudden, forceful, uncontrolled burst of air through the nose and mouth.


Diseases & Conditions
Transplant rejection
Transplant rejection is a process in which a transplant recipient's immune system attacks the transplanted organ or tissue.