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Overview

What Is Angioedema?

Angioedema is sudden swelling in the deeper layers of the skin and tissues beneath it. It commonly affects the lips, eyelids, face, hands, feet, mouth, or throat. Angioedema may occur with hives or on its own, and it can affect people of any age. The swelling may develop quickly and range from mild to life-threatening when it involves the airway.

Emergency Warning Signs

Emergency Warning Signs of Angioedema

CALL EMERGENCY SERVICES

Possible airway swelling is an emergency

Call emergency services immediately for trouble breathing, throat tightness, tongue or throat swelling, faintness, confusion, or rapidly worsening angioedema symptoms. Do not wait for these symptoms to improve on their own.

  • Difficulty breathing can indicate that swelling is affecting the airway.
  • Difficulty swallowing may occur when the mouth, tongue, or throat is swollen.
  • A hoarse voice can be a sign of swelling around the throat or voice box.
  • Sudden tongue swelling requires immediate emergency assessment.
  • Throat tightness may signal narrowing of the airway.
  • Wheezing can indicate serious breathing difficulty.
  • Dizziness may occur when a severe reaction affects circulation or breathing.
  • Fainting is an emergency symptom that requires immediate medical help.

Symptoms

Angioedema Symptoms

  • Sudden swelling of the lips.
  • Swelling of the eyelids.
  • Swelling of the face.
  • Swelling of the tongue.
  • Swelling of the hands.
  • Swelling of the feet.
  • Swelling of the genitals.
  • Abdominal pain.
  • Nausea.
  • Vomiting.
  • Diarrhea.
  • Itching.
  • Hives (urticaria).
  • Skin tightness over the swollen area.

Angioedema symptoms may develop over minutes to hours. They can last longer depending on the cause, and some forms may recur. Swelling may occur with hives or without them, so the absence of hives does not rule out angioedema.

Causes

Angioedema Causes

Angioedema is a sudden swelling of the deeper layers of the skin, often affecting the lips, face, tongue, throat, hands, or feet. It can have several causes. Common triggers include allergic reactions to foods, medications, insect bites, or latex. Some cases are caused by medications such as ACE inhibitors. Angioedema can also occur due to infections, autoimmune conditions, or hereditary factors. In some people, no specific cause can be identified, which is known as idiopathic angioedema. If swelling affects the tongue or throat and causes difficulty breathing, urgent medical attention is required.

Risk Factors

Angioedema Risk Factors

  • A family history of hereditary angioedema increases the likelihood of an inherited form.
  • A history of allergic reactions may increase the risk of histamine-related swelling.
  • Using an ACE inhibitor medicine can trigger bradykinin-mediated angioedema in some people.
  • Autoimmune disease may be associated with acquired angioedema.
  • Previous episodes of unexplained or recurrent swelling increase the chance of future attacks.
  • Exposure to a known food, medicine, insect, or environmental allergen can trigger another episode.

Some risk factors cannot be changed, including inherited complement-related conditions and family history. Medication exposure and known allergens may be potentially modifiable, but medicines should be stopped or changed only with guidance from a clinician. In some people, including those with idiopathic angioedema, no clear risk factor or trigger can be found.

Complications

Angioedema Complications

  • Airway blockage can occur when swelling affects the tongue or throat.
  • Respiratory failure can result from severe airway swelling or untreated breathing difficulty.
  • Vomiting or diarrhea can cause dehydration, especially during a prolonged abdominal attack.
  • Severe abdominal pain may occur when swelling affects the digestive tract.
  • Missing the underlying cause can lead to unnecessary emergency procedures or treatments.
  • Recurrent attacks can reduce quality of life and interfere with daily activities.

KNOW THE RISK

Airway swelling can become life-threatening

Swelling of the tongue or throat can progress quickly. Treat it as an emergency and call emergency services immediately, particularly if breathing, swallowing, or speaking becomes difficult.

Diagnosis

How Angioedema Is Diagnosed

Clinicians usually diagnose angioedema from the medical history and physical examination. They may ask when the swelling began, which body areas are affected, whether hives are present, and whether you recently ate a particular food or started a medicine. They may also ask about family history, abdominal symptoms, previous episodes, and how you responded to prior treatment.

Targeted Tests for Angioedema

Treatment & Management

Angioedema Treatment and Management

The treatment of angioedema depends on its cause and severity. Mild cases may be treated with antihistamines, especially when the swelling is related to an allergic reaction. Corticosteroids may also be used in some cases. If angioedema is caused by a medication, the suspected drug should be discontinued under medical supervision.

Severe angioedema involving the tongue or throat can obstruct the airway and requires emergency medical treatment. Epinephrine (adrenaline) is the first-line treatment when angioedema occurs as part of anaphylaxis. Patients with recurrent or hereditary angioedema may require specialized treatments and preventive therapy. Identifying and avoiding known triggers is also an important part of long-term management.

Prevention

Can Angioedema Be Prevented?

  • Avoid foods or environmental triggers that have been linked to previous episodes.
  • Record each episode, including symptoms, timing, medicines, foods, and other exposures.
  • Review possible medication triggers with a clinician before stopping or changing any medicine.
  • Wear medical identification when advised, especially when a recurrent or hereditary form is diagnosed.
  • Follow your prescribed emergency plan and keep recommended medicines available.

Hereditary angioedema requires specialist prevention planning, which may include preventive treatment for people with frequent or severe attacks. Episodes described as idiopathic angioedema may not be fully preventable because no trigger is identified. Keeping a record of symptoms can still help clinicians find patterns and improve the treatment plan.

Outlook and Prognosis

Angioedema Outlook and Prognosis

Many histamine-mediated episodes improve within a day or over several days, although the exact duration varies. Bradykinin-mediated and hereditary forms may last longer and can recur without an appropriate management plan. The outlook for idiopathic angioedema also varies because the cause may remain unclear. Any episode involving the tongue or throat needs urgent attention, regardless of its expected duration.

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