<unk> is the state of insufficient blood flow to the tissues of the body as a result of problems with the circulatory system. Initial symptoms of<unk> may include weakness, fast heart rate, fast breathing, sweating, anxiety, and increased thirst. This may be followed by confusion, unconsciousness, or cardiac arrest, as complications worsen.<unk> is divided into four main types based on the underlying cause: low volume, cardiogenic, obstructive, and distributive<unk>  Low volume<unk>  also known as hypovolemic<unk>  may be from bleeding, diarrhea, or vomiting. Cardiogenic<unk> may be due to a heart attack or cardiac contusion. Obstructive<unk> may be due to cardiac tamponade or a tension pneumothorax. Distributive<unk> may be due to sepsis, anaphylaxis, injury to the upper spinal cord, or certain overdoses. The diagnosis is generally based on a combination of symptoms, physical examination, and laboratory tests. A decreased pulse pressure (systolic blood pressure minus diastolic blood pressure) or a fast heart rate raises concerns. The heart rate divided by systolic blood pressure, known as the<unk> index (SI), of greater than 0.8 supports the diagnosis more than low blood pressure or a fast heart rate in isolation. Treatment of<unk> is based on the likely underlying cause. An open airway and sufficient breathing should be established. Any ongoing bleeding should be stopped, which may require surgery or embolization. Intravenous fluid, such as Ringer's lactate or packed red blood cells, is often given. Efforts to maintain a normal body temperature are also important. Vasopressors may be useful in certain cases.<unk> is both common and has a high risk of death. In the United States about 1.2 million people present to the emergency room each year with<unk> and their risk of death is between 20 and 50%.
Shock 
Shine 
Hand
Skull
Head
Mouth
Shoe
Kidney