Diagram of a human body with the heading: Signs and symptoms of anaphylaxis. There are the following labels, from top right, clockwise: central nervous system: lightheadedness, loss of consciousness, confusion, headache, anxiety, respiratory: shortness of breath, wheezes or stridor, hoarseness, pain with swallowing, cough, gastrointestinal: crampy abdominal pain, diarrhoea, vomiting, loss of bladder control, pelvic pain, skin: hives, itchiness, flushing, heart and vasculature: fast or slow heart rate, low blood pressure, swelling of lips, tongue and/or throat, runny nose, swelling of the conjuctiva.