Erythrocyte pressure product helps to understand the increase and decrease in red blood cells. When the absolute value of red blood cells increases due to various causes, there is a corresponding increase in red blood cell pressure product. High Erythrocyte Pressure Volume is found after a patient is in shock and is detected by routine blood tests. There are many causes of shock, and there are various ways to classify them. From the clinical point of view, shock can be classified according to its etiology and pathophysiological characteristics: 1, cardiogenic shock; 2, hypovolemic shock; 3, infectious shock; 4, anaphylactic shock; 5, neurogenic shock; 6, other endocrine insufficiency (hypoadrenocorticism, hypothyroidism, etc.) and endocrine hyperfunction (such as thyroid crisis, hyperparathyroidism, carcinoid and The patient may be in shock due to endocrine insufficiency (hyperalgesia, hypothyroidism, etc.) and endocrine hyperfunction (e.g., thyroid crisis, hyperparathyroidism, carcinoid tumor and primary aldosteronism).