The most important thing you can do to protect yourself from blood clots and embolism is to know the symptoms.
Blood clot symptoms include pain, redness, swelling, warmth, and tenderness near the clot. Embolism symptoms include shortness of breath, chest pain, and coughing up blood.
If your doctor suspects a DVT, an ultrasound (a type of imaging test of the blood vessel that uses sound waves) may be done. If a lung cancer patient continues to be short of breath with a normal chest X-ray, a chest CT scan with dye injection should be done, which is the best way to show a pulmonary embolism. People with lung cancer may have shortness of breath already, so you need to be aware of this danger.
Treatment of DVT involves giving blood thinning medications by injection under the skin or directly into the blood. You might also be given oral blood thinners for six months or longer.
In a word, awareness is key to protecting your health. The best way to prevent blood clots is to get some daily physical activity, like walking. The best way to prevent PE is to be aware of the symptoms of DVT and let your doctor know right away if you're experiencing these symptoms so you can get started on treatment.