Can a dvt without any symptoms kill you or would the lack of symptoms indicate an insignificant problem?

Not always symptoms: Only 50% of DVTs cause symptoms, and even asymptomatic ones can be fatal. Recognize that if you smoke, are obese, sit for long periods of time, or are prone to dehydration you are at risk. You should educate yourself to watch for symptoms like asymmetric swelling or venous congestion in the skin, as well as take measures like hydration and activity to protect yourself. Blood thinners maybe

Dvt: If you are suspicious then it makes sense to be evaluated with a venous Doppler sonogram