Symptoms

Anaphylaxis symptoms usually occur within minutes of exposure to an allergen. Sometimes, however, anaphylaxis can occur a half-hour or longer after exposure. Anaphylaxis symptoms include:

• Skin reactions, including hives along with itching, and flushed or pale skin (almost always present with anaphylaxis)
• A feeling of warmth
• The sensation of a lump in your throat
• Constriction of the airways and a swollen tongue or throat, which can cause wheezing and trouble breathing
• A weak and rapid pulse
• Nausea, vomiting or diarrhea
• Dizziness or fainting