The vast majority of vein stones form because of the presence of hemangiomas, in which the blood flow is slowed down due to turbulence and thrombosis can easily occur. Once a thrombus occurs, it will be gradually mechanized and absorbed with the progress of time and cause local inflammation, tissue proliferation and fibrosis process, after the tissue fibrosis, there will be gradual calcification phenomenon, when the calcification to a certain degree will appear visible vein stones. This kind of vein stone usually causes local irritation and pain, and small granular white-yellow hard stones can be seen after surgical removal, which usually need to be surgically removed, otherwise it will cause long-term local irritation.