Shock is a word used to describe a certain abnormal state in the body.
In this state, the body's circulation does not supply enough blood and oxygen to vital organs, such as the kidneys and the brain. Shock can have several different causes. One of the causes of shock is sepsis , a serious infection that involves the blood. This type of shock is known as septic shock. People with shock usually have symptoms from the source of the infection, such as a lung or kidney infection.