Venous hemangiomas are generally not serious if they are small, but larger venous hemangiomas are more serious. Smaller venous hemangiomas are generally not serious, and most patients do not have obvious symptoms, and the condition can be controlled through timely treatment, which generally does not cause adverse reactions. However, if it is a large venous hemangioma, which is protruding under the skin, then the condition is relatively serious; because larger hemangiomas are likely to rupture on their own, which can easily cause bleeding, and when the amount of bleeding increases it can cause ischemic shock, which, if not resuscitated in time, can be life-threatening, so this kind of patients need to be treated in time. In addition, venous hemangiomas in critical areas, although the volume of the tumor is not large, but still may cause adverse consequences. For example, hemangiomas in the brainstem, because of their proximity to key life centers, lesions can easily cause damage to these centers, and surgical and other treatments can be dangerous. Overall, however, venous hemangiomas are not particularly serious, and as long as they can be treated in a timely manner, they can be effectively prevented from a range of complications and dislodged blood clots; nevertheless, once a venous hemangioma has been detected, it is important to seek medical attention in a timely manner and choose the optimal treatment according to the doctor’s advice in order to avoid delays in the condition.