Answer:Deep vein thrombosis, or DVT
Explanation:Deep vein thrombosis, or DVT,is a condition that results from a blood clot which occurs in a vein deep within the body. Usually it occurs in lower leg or thigh and may result to swelling which is referred to as thrombophlebitis.
It can affect the lungs when it breaks to the whole body and my cause pulmonary embolism in the lungs.
It may be caused by certain medical conditions,or if you sit without any movement for a long time such as sitting in an airplane.