Is angioedema the same as hives?

They are closely related but affect different depths of skin. Hives are itchy raised wheals in the upper layers of the skin, while angioedema is swelling in the deeper tissue, which feels tight or painful rather than itchy. About half of people with hives also get angioedema. Angioedema without hives is a clue that a non-allergic cause, such as medication or a C1 inhibitor problem, may be responsible.

Can a blood pressure tablet I've taken for years suddenly cause angioedema?

Yes. ACE inhibitors such as lisinopril, ramipril, and enalapril can cause angioedema at any point, sometimes years after starting them, and the swelling typically affects the face, lips, and tongue without hives. If this happens, your doctor will usually switch you to a different class of blood pressure medication. Do not stop the tablet yourself without arranging an alternative, as uncontrolled blood pressure carries its own risks.

What is hereditary angioedema?

Hereditary angioedema is a rare genetic condition in which a shortage or malfunction of C1 inhibitor protein allows excess bradykinin to build up, causing recurrent attacks of swelling in the skin, gut, and airway. It usually starts in childhood or adolescence, does not cause hives, and does not respond to antihistamines, steroids, or adrenaline. It needs specialist care with specific medications for attacks and prevention.

DermatologicalICD-10: T78.3Relatively common as part of allergic reactions and hives; hereditary angioedema is rare

Angioedema

Also known as: Angioneurotic oedema, Quincke's oedema

Angioedema is sudden swelling in the deeper layers of the skin and the tissue beneath it, most often around the eyes, lips, face, hands, feet, or genitals. It can also affect the lining of the gut, causing abdominal pain, and the throat, where it can block the airway and become life-threatening. Angioedema frequently occurs alongside hives (urticaria) as part of an allergic reaction to food, medication, or insect stings, but it can also be triggered by certain blood pressure medications, by inherited or acquired deficiencies in a blood protein called C1 inhibitor, or without any identifiable cause. Each episode usually settles within one to three days. Treatment depends on the type, which is why finding the cause matters.

At a Glance

Common symptoms: Sudden swelling of the lips, eyelids, face, tongue, hands, feet, or genitals, Swelling that is firm and often painless, but may feel tight, tingly, or burning rather than itchy, Raised itchy wheals (hives) on the skin in allergic and many spontaneous cases
Main treatments: Emergency treatment with adrenaline (epinephrine), antihistamines, and steroids for allergic angioedema affecting the airway or with signs of anaphylaxis, Non-sedating antihistamines, often at higher than standard doses, for allergic and idiopathic angioedema, Short courses of oral corticosteroids for severe episodes
Category: Dermatological · Relatively common as part of allergic reactions and hives; hereditary angioedema is rare
See a doctor if: Swelling of the tongue, throat, or lips with difficulty breathing or swallowing, hoarseness, or wheeze: call emergency services immediately

Symptoms

Sudden swelling of the lips, eyelids, face, tongue, hands, feet, or genitals

Swelling that is firm and often painless, but may feel tight, tingly, or burning rather than itchy

Raised itchy wheals (hives) on the skin in allergic and many spontaneous cases

Swelling of the tongue or throat causing difficulty swallowing, a hoarse voice, or noisy breathing

Crampy abdominal pain, vomiting, or diarrhoea from swelling in the gut wall (typical of hereditary angioedema)

Episodes lasting one to three days before fading without leaving marks

Causes

Allergic reactions to foods (such as nuts, shellfish, eggs, milk), medications, latex, or insect stings
ACE inhibitor blood pressure medications, which can cause angioedema even after years of use
Non-steroidal anti-inflammatory drugs such as ibuprofen and aspirin
Hereditary angioedema, caused by a genetic deficiency or malfunction of C1 inhibitor protein
Acquired C1 inhibitor deficiency associated with certain blood disorders or autoimmune diseases
Idiopathic angioedema, where no cause is found, sometimes linked to thyroid autoimmunity or chronic urticaria

Risk Factors

A history of allergies, hives, asthma, or eczema
Taking ACE inhibitors, particularly in people of African ancestry, who have a higher risk
A family history of angioedema
Previous episodes of angioedema
Autoimmune conditions such as lupus or thyroid disease
Lymphoma or other blood disorders (acquired C1 inhibitor deficiency)

Diagnosis

A detailed history of episodes, triggers, medications, and family history, plus examination during an attack if possible
Allergy testing (skin prick or blood tests) when an allergic trigger is suspected
Blood tests for C4 and C1 inhibitor levels and function if hereditary or acquired angioedema is suspected, especially when hives are absent
Thyroid tests and screening for autoimmune or blood conditions in recurrent unexplained cases
Review of all medications, particularly ACE inhibitors and NSAIDs

Treatment

Emergency treatment with adrenaline (epinephrine), antihistamines, and steroids for allergic angioedema affecting the airway or with signs of anaphylaxis
Non-sedating antihistamines, often at higher than standard doses, for allergic and idiopathic angioedema
Short courses of oral corticosteroids for severe episodes
Stopping the responsible medication, under medical supervision, and switching to an alternative; never stop blood pressure medication on your own
C1 inhibitor concentrate, icatibant, or other targeted therapies for hereditary angioedema, which does not respond to antihistamines or adrenaline
Long-term preventive treatment for hereditary angioedema, such as regular C1 inhibitor infusions or newer medicines like lanadelumab
Supportive: an emergency action plan, a medical alert bracelet, and carrying an adrenaline auto-injector if prescribed

Prevention

Avoid known allergic triggers and read food and product labels carefully
Tell every healthcare provider about previous angioedema before any new medication, especially ACE inhibitors or NSAIDs
Carry prescribed emergency medication at all times and make sure family members know how to use it
People with hereditary angioedema should take preventive doses before dental work or surgery as advised by their specialist
Manage stress and infections, which can trigger attacks in hereditary angioedema

When to See a Doctor

Swelling of the tongue, throat, or lips with difficulty breathing or swallowing, hoarseness, or wheeze: call emergency services immediately
Swelling accompanied by dizziness, a fast heartbeat, or collapse (signs of anaphylaxis)
A first episode of angioedema, even if mild, to identify the cause
Recurrent episodes, episodes without hives, or a family history of swelling
Severe abdominal pain with a history of angioedema

Frequently Asked Questions

Related Conditions

Hives

Dermatological

Allergic Rhinitis

Respiratory

High Blood Pressure

Cardiovascular

Lupus

Autoimmune

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