Anaphylaxis is a severe allergy. Symptoms can begin suddenly and progress rapidly. If the victim is unconscious, call 911 immediately. Look for several telltale signs that indicate anaphylaxis:
- Difficulty breathing
- Swelling of the face, throat, or lips
- Hives or itching
- Clammy skin
- Rapid heart rate
- Lightheadedness
- Low blood pressure
- Nausea or vomiting
- Shock