Platelets below 50×10^3/mL means that the number of platelets per milliliter of blood in peripheral blood is below 50,000. If the number of platelets is below 50,000/mL, generally speaking, the body will not experience significant and serious bleeding, but if the number of platelets is below 30×10^3/mL, spontaneous bleeding is likely to occur, and patients without trauma In the absence of trauma, patients are prone to bleeding symptoms, including bleeding spots and petechiae on the skin and mucous membranes, or even bleeding from the nose and gums, or internal bleeding such as vomiting blood or black stools. If the patient also has hypertension and other diseases, brain hemorrhage is sometimes triggered. Platelets below 50×10^3/mL usually do not cause significant bleeding symptoms if a patient has no underlying disease, but if the platelet count is below 30×10^3/mL and there are other concomitant diseases, severe bleeding is often induced.