Finger bruising may be caused by cold, systemic diseases, shock and other factors. 1. Cold: low ambient temperature and inadequate warming measures can lead to cold fingers, poor blood circulation and symptoms of finger bruising. 2. Systemic diseases: Chronic obstructive pulmonary disease (COPD), left heart failure and other diseases may lead to symptoms of respiratory distress, the body’s oxygen content is reduced, the finger due to a lack of oxygen cyanosis symptoms. 3. Shock: massive blood loss, burns and other factors, can lead to symptoms of shock, the body’s effective circulating blood volume is insufficient, the peripheral circulation capacity is poor, finger bruising. There are a lot of factors that lead to finger bruising, you can go to the hospital in time to identify the cause of the disease and then carry out the relevant treatment.