Thrombosis is blood clots. Yes it can cause heart disease. Although there are few symptoms, If left untreated it could mean death.

The symptoms are either no symptoms or the feeling that something’s not right.

Medications are used to treat this disease. However; if left untreated many of other things in your body can go wrong.
Some of these conditions are as listed if left untreated:

If  Thrombosis is misdiagnosed  then more complications set in like:

A simple blood test can tell a doctor if you have Thrombosis.
Blood clots are usually hot or inflamed and move very slowly. If you  think you may have a blood clot which can for anywhere call your doctor immediately.