immune disorders
Angioedema
Acute angioedema
Acute angioedema develops suddenly after exposure to a trigger. Common triggersare , other Nonsteroidal Anti-Inflammatory Drugs (NSAIDs), angiotensin-converting enzyme (ACE) inhibitors, and certain opioids (called opiates) such as Insect stings or bites Allergy injections ( Allergen immunotherapy (desensitization) ) Certain foods—particularly eggs, fish, shellfish, nuts, and fruits Angioedema without hives is sometimes caused by ACE inhibitors, which are used to treat high blood pressure and heart failure. When ACE inhibitors are the cause, the face and upper airways are most commonly affected, but the intestine may be affected. Eating even a tiny amount of some foods can suddenly result in angioedema. But with other foods (such as strawberries), these reactions occur only after a large amount is eaten. Also, angioedema sometimes occurs after a substance that can be seen on x-rays ( Radiopaque Contrast Agents ) is used during an imaging test. 