The main danger of low platelets to the body is bleeding, and the main role of platelets in the body is to stop bleeding. If there is bleeding, platelets will immediately reach the bleeding site and act to start the clotting process. If platelets are reduced, the body will show signs of bleeding, most commonly bleeding from the skin and mucous membranes, such as petechiae when the skin is bumped. Spontaneous bleeding can occur when platelets are severely reduced, including gastrointestinal bleeding, brain bleeding, and other serious health hazards. Bleeding can continue to cause severe blood loss, anemia and hypovolemia, shock, and other manifestations. If platelets are severely reduced, life-threatening bleeding can occur. Therefore, the most important effect of thrombocytopenia on the body is that it can cause poor coagulation. Once thrombocytopenia is detected, it should be actively prevented and treated for thrombocytopenia at the same time. If bleeding tendencies are found in the body, testing of platelet count and function should be performed to avoid further damage to the body due to bleeding caused by thrombocytopenia.