Common causes of intra-articular hemorrhage of the fingers include trauma and low platelet count. 1. Trauma: there is a clear history of trauma, which can be caused by falling with both hands on the ground, blunt force trauma, etc., resulting in damage to the skin, muscles, tendons, blood vessels, and other soft tissues of the palm of the hand or metacarpal bone fracture, which can cause bleeding. 2. Low platelets: Low platelets can lead to decreased blood clotting function, which can cause bleeding even without obvious trauma. Common causes of low platelet include excessive platelet loss, decreased platelet production and abnormal platelet distribution. Excessive platelet loss is commonly seen in massive platelet loss after hemorrhage, resulting in decreased coagulation function; decreased platelet production is commonly seen in severe infections, aplastic anemia, chemotherapy, etc. affecting bone marrow hematopoiesis, resulting in decreased production; abnormal platelet distribution is mostly seen in splenomegaly caused by portal hypertension due to cirrhosis, and excessive destruction of platelets due to hypersplenism. The causes of intra-articular hemorrhage in the finger joints are quite varied, and it is recommended to consult a doctor in time to clarify the cause of the disease and carry out targeted treatment.