Hemangioma is not unfamiliar to pregnant women, but it is unfamiliar to many friends. It is a benign tumor of congenital origin, and also belongs to a kind of skin disease, of course, there is no deterioration in general, and its growth is relatively slow, so there is no need to panic if you have hemangioma, and early consultation at a regular hospital will not be a problem. In addition, many friends are very interested in how hemangioma is caused, so let’s take a look at the following. We hope you will find this helpful. Most of the hemangiomas are congenital in nature, mostly seen in babies born with bright red spots on the occipital area, which are composed of a large number of proliferating blood vessels and are common soft tissue tumors. When the tumor increases in size, it can compress and push the neighboring organs and show various symptoms. For example, compression of lower esophagus, stomach and duodenum may cause difficulty in swallowing, abdominal distension, abdominal pain and belching; compression of liver and biliary tract may cause gallbladder effusion and obstructive jaundice; compression of portal vein may cause portal hypertension, compression of inferior vena cava may cause ascites, and pregnant women may affect delivery. Swollen hemangioma can cause hepatic hemorrhage due to internal pressure or external force (extrusion, impact, antagonistic movement, etc.), resulting in death of the patient. If hepatic hemangioma is left untreated for a long time, it may turn into a malignant tumor and endanger life. There is no accurate statement about the specific cause of hepatic hemangioma, but it has been proved that it is related to the increase of estradiol level. There are also reports that the formation of hemangiomas in the mother’s abdomen is closely related to the flow and pressure in the vasculature. As opposed to clinical manifestations, hemangiomas are essentially divided into two types: first, vascular malformations that result from vascular overdevelopment or abnormal differentiation during embryonic development, and second, true tumors that arise from abnormal proliferation of vascular endothelial cells. In addition, hemangiomas can be divided into four types according to their structure, although the clinical course and prognosis are different and vary greatly. According to the above brief introduction, how hemangioma is caused should not be so unfamiliar to everyone. I hope the content of this article can bring help to those who need it, and I also hope that after understanding its related knowledge, we have a correct knowledge of hemangioma, although its growth is slow and rarely deteriorates, there is a certain possibility of lesion, and once it happens, the lesion may be life-threatening. Therefore, early treatment after detection is the best choice.