Key Symptoms of Anaphylaxis - Hives or urticaria i.e. red swollen bumps and wheels - Angioedema i.e. swelling of mucous membranes and skin - Fast and shallow breathing - Hypotention i.e. low blood pressure - Nausea and vomiting - Diarrhea - Dizziness and fainting - Pale and clammy skin - Weak but rapid pulse - Difficulty in swallowing - Runny nose