You will not get any symptoms until your veins are tight enough to prevent blood from reaching the organs and tissues. Sometimes a blood clot completely prevents blood flow or even breaks down and causes a heart attack or stroke.
Causes
High blood pressure
High cholesterol
High triglycerides, a type of fat (lipid) in your blood
Smoking and other sources of tobacco
Insulin resistance, obesity or diabetes
Inflammation from diseases, such as arthritis, lupus or infections
Eclipse of the vessels is a slow and progressive disease that may start in childhood. Although the underlying cause is unclear, however, vascular arches may be damaged or injured in the inner layer of the vessel.
When the internal wall of the vein is damaged, blood and other blood cells accumulate in the area of damage and internal wall of the vessel.