Possible causes of phleboliths include:
Pressure in veins: This occurs when pressure builds up in vessel walls due to urinary phleboliths. Injury of any kind to the vein walls caused by vein pressure can lead to the development of phleboliths.
Varicose veins: Considered a symptom of phleboliths, varicose veins may cause them as well. Varicose veins are overstressed, dilatated veins that can lead to blood vessel damage and phlebolith development.
Bowel movements: Due to consistent straining of bowel movements. This can lead to increased blood pressure and create problems that result in phlebolith development.
Liver disease: In addition to the other problems that liver disease can cause, it may also lead to the development of phleboliths in your abdominal organs.
Other causes: Phleboliths are associated with benign tumor growth in young people. These include stomach cancer and other gastrointestinal tumors.