Thrombocytopenia is mainly harmful to the human body as bleeding, manifested as nosebleed, gum bleeding, skin mucous membrane bleeding, etc. In severe cases, internal bleeding can occur, which is life-threatening. Platelets are mainly involved in hemostasis and tissue repair. Under normal circumstances, platelets have a lifespan of 8~10 days, and when there is a pathological process such as generative disorder or increased consumption and immune clearance, it can lead to a shortening of its lifespan and bring harm to the organism, which is mainly manifested in the following aspects: bleeding of tissues and organs: 1. Skin with bleeding spots, petechiae, bruises, etc., especially in the limbs. 2. Bleeding in the oral cavity and mucous membranes: blood blisters in the oral cavity, bleeding from mucous membranes, nosebleeds, etc. 3. Bleeding from digestive tract and urinary tract: gastroduodenal bleeding, blood in urine, etc. 4. Cerebral hemorrhage is the most serious and can endanger the patient’s life. If any of the above situations occurs, you should consult the doctor in time, make a clear diagnosis, and carry out targeted treatment under the guidance of the doctor.