Hemangiomas are generally not cancerous. Hemangioma is a common vascular neoplastic disease, which is mainly caused by venous malformation or vascular endothelial cell proliferation. According to their pathological features, they can be divided into benign hemangiomas, junctional hemangiomas and malignant hemangiomas. Benign tumors include congenital hemangiomas, epithelioid hemangiomas, etc., which generally have a better prognosis. Junctional hemangiomas such as reticuloendothelioma, Kaposi’s sarcoma, etc., this kind of tumor is between benign and malignant, with invasive growth in the local area, and seldom develops into malignant tumors; however, individual hemangiomas may undergo abnormal malignant proliferation, erode muscles and bones, and lead to pathological fracture, and some hemangiomas growing in special areas may also be life-threatening. Malignant hemangiomas, including hemangiosarcoma, are sarcomas caused by abnormal proliferation of endothelial cells in blood vessels or endothelial cells in lymphatic vessels, which are prone to metastasis to distant lymph nodes and organs, and the prognosis is relatively poor after treatment. Some hemangiomas can subside naturally, or local treatment under the guidance of doctors can achieve good results. Junctional or malignant hemangiomas can be treated with surgery or medication according to the condition, and malignant hemangiomas can be treated with radiotherapy and chemotherapy after surgery depending on the condition.