Too thick blood refers to the increased viscosity of blood and slow blood flow, which can easily produce hyper viscousemia and even induce thrombosis and embolism formation. Therefore, the symptoms caused by too thick blood are: i. Symptoms of central nervous system ischemia and hypoxia, and patients show a series of uncomfortable symptoms such as dizziness, tinnitus, blurred eyes, and head swelling. Second, if thrombosis and embolic diseases occur, different symptoms will appear. For example, if cerebral thrombosis occurs, the patient may have symptoms such as inability to move one limb, slurred speech and crooked mouth. In case of acute myocardial infarction, symptoms such as chest pain, chest tightness and profuse sweating are manifested. Therefore, too thick blood can cause a series of symptoms of tissue ischemia, hypoxia or failure, and requires timely treatment, more water, attention to a low-salt, low-fat diet, and also appropriate treatment according to the specific cause of too thick blood.