Anaphylaxis shock is a dangerous and potentially life-threatening condition caused by an allergic reaction. Anaphylactic shock is a complication of anaphylaxis that occurs when the blood pressure drops very low, and the blood has trouble circulating. 

The most common symptoms of an anaphylactic shock include:

*nose, mouth, skin, or stomach irritation, such as a rash, diarrhea, or congestion
*breathing difficulties or wheezing
*low blood pressure that can cause fainting, dizziness, or confusion
*swelling of the mouth, tongue, or throat
*swollen lips
*a choking sensation or trouble swallowing