Angioedema Angioedema Angioedema is swelling of areas of tissue under the skin, sometimes affecting the face and throat. Angioedema can be a reaction to a drug or other substance (trigger), a hereditary disorder... read more is swelling of areas of tissue under the skin that sometimes affects the face, throat, and airways.
Most angioedema is caused by an allergic reaction, Overview of Allergic Reactions Allergic reactions (hypersensitivity reactions) are inappropriate responses of the immune system to a normally harmless substance. Usually, allergies cause sneezing, watery and itchy eyes, a... read more but sometimes it is caused by a hereditary disorder or another disorder such as cancer.
Unlike angioedema caused by an allergic reaction, hereditary angioedema and acquired angioedema do not cause hives or itching.
Blood tests help doctors diagnose the disorder.
Certain drugs can help relieve symptoms, but if angioedema makes swallowing or breathing difficult, prompt emergency treatment is needed.
(See also Overview of Allergic Reactions Overview of Allergic Reactions Allergic reactions (hypersensitivity reactions) are inappropriate responses of the immune system to a normally harmless substance. Usually, allergies cause sneezing, watery and itchy eyes, a... read more .)
Hereditary angioedema is a genetic disorder that causes a deficiency or malfunction of C1 inhibitor. C1 inhibitor is one of the proteins in the complement system Complement System One of the body's lines of defense (immune system) involves white blood cells (leukocytes) that travel through the bloodstream and into tissues, searching for and attacking microorganisms and... read more , which is part of the immune system. Symptoms usually start during childhood or adolescence.
Acquired angioedema, a rare disorder, differs from hereditary angioedema. It develops when certain cancers, such as lymphoma Overview of Lymphoma Lymphomas are cancers of lymphocytes, which reside in the lymphatic system and in blood-forming organs. Lymphomas are cancers of a specific type of white blood cells known as lymphocytes. These... read more , or autoimmune disorders, such as systemic lupus erythematosus Systemic Lupus Erythematosus (SLE) Systemic lupus erythematosus is a chronic autoimmune inflammatory connective tissue disorder that can involve joints, kidneys, skin, mucous membranes, and blood vessel walls. Problems in the... read more (lupus) or dermatomyositis Autoimmune Myositis Autoimmune myositis causes inflammation and weakness in the muscles (polymyositis) or in the skin and muscles (dermatomyositis). Muscle damage may cause muscle pain and muscle weakness may cause... read more , cause a deficiency of C1 inhibitor. Symptoms usually start later in life, after people have developed a disorder that can cause this deficiency.
In both hereditary and acquired angioedema, swelling (angioedema) may be triggered by
A minor injury, as may occur during a dental procedure
A viral infection
Drugs that contain or are related to estrogen (such as tamoxifen)
Certain medications for high blood pressure such as angiotensin-converting enzyme (ACE) inhibitors and angiotensin II receptor blockers (ARBs)
Exposure to cold
Although certain foods and drugs may trigger the angioedema, it is not an allergic reaction to those substances.
Stress, such as that felt before having a dental or surgical procedure, can make angioedema worse.
The face, lips, tongue, the back of the hands or feet, genitals, and/or other areas of the body may swell. Typically, the swollen areas are slightly painful and not itchy. Hives do not appear. Swelling usually resolves in 1 to 3 days.
The membranes lining the mouth, throat, and airways may also swell. People may make a gasping sound when they breathe in. Such swelling can interfere with breathing and be life threatening. If these symptoms develop, people should see a doctor right away.
The membranes lining the digestive tract may also swell. Nausea, vomiting, and cramps are common.
Doctors suspect hereditary or acquired angioedema if both of the following are present:
People have swelling in the face, lips, tongue, hands, feet, genitals, and/or other areas of the body but do not have hives.
The swelling recurs, and no cause is apparent.
Doctors also suspect one of these disorders if angioedema is triggered by a minor injury.
If family members also have these symptoms, doctors suspect hereditary angioedema.
Doctors diagnose hereditary or acquired angioedema by measuring C1 inhibitor levels or activity in a sample of blood.
Drugs such as ecallantide, icatibant, or C1 inhibitor
Fresh frozen plasma
Drugs to prevent future attacks
Drugs that can sometimes relieve the swelling include ecallantide, icatibant, purified C1 inhibitor (which is derived from human blood), and recombinant C1 inhibitor (which is obtained from the milk of genetically modified rabbits). Giving C1 inhibitor replenishes the missing or malfunctioning C1 inhibitor. These drugs are given by vein or injection under the skin.
Because hereditary angioedema is rare, the person's doctor usually checks whether the local health care facility has one of these necessary drugs. If the person has had a severe reaction, the doctor may give the person one of these drugs to keep at home and use when an attack starts. The person or family members are taught how to inject the drugs themselves. The earlier treatment begins, the better.
When these drugs are not available, fresh frozen plasma Plasma People are sometimes given transfusions of whole blood during severe bleeding (for example after an injury or pregnancy complications), but usually they are given only the blood component they... read more or, in the European Union, tranexamic acid may be used. Antihistamines and corticosteroids are not effective.
Pain relievers, drugs to relieve nausea (antiemetic drugs), and fluids may help relieve symptoms.
Sometimes if the airway suddenly swells and people have difficulty breathing, doctors must open the airway. To do so, they may inject epinephrine under the skin or into the muscle to reduce the swelling. However, epinephrine may not reduce the swelling quickly or long enough. Then doctors insert a breathing tube in the windpipe through the person’s mouth or nose (intubation).
Sometimes doctors have to make a small incision in the skin over the windpipe (trachea) to insert the breathing tube.
Drugs to prevent attacks of angioedema
Several treatments can be used to help prevent episodes of angioedema in people with hereditary angioedema. They include
C1 inhibitor derived from human blood
Synthetic male hormones
Antifibrinolytics (eg, tranexamic acid)
C1 inhibitor derived from human blood can be used to prevent attacks. However, recombinant C1 inhibitor cannot.
Lanadelumab is a monoclonal antibody Monoclonal Antibodies Immunotherapy is the use of medications that mimic or modify components of the immune system (such as tumor antigens and immune checkpoints—see also Overview of the Immune System) to fight disease... read more (a manufactured antibody) that targets and suppresses one of the substances involved in causing angioedema. Lanadelumab is given by injection under the skin every 2 weeks. It can be used to prevent attacks in people 12 years of age and older.
Berotralstat suppresses the same substance as lanadelumab and is taken by mouth 3 times a day.
Stanozolol and danazol (which are synthetic male hormones) may help prevent subsequent attacks. These drugs, taken by mouth, can stimulate the body to produce more C1 inhibitor, but they may be less effective for acquired angioedema. Because these drugs can have masculinizing side effects, the dose is reduced as soon and as much as possible when these drugs are given to women for a long time.
Stanozolol or danazol may be given 5 days before until 2 days after a dental or surgical procedure. Or C1 inhibitor, if available, may be given 1 hour before dental or surgical procedures instead of stanozolol or danazol.
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