Deep vein thrombosis (DVT) is a condition in which a blood clot (thrombus) forms in one or more of the deep veins in your body, usually in your legs. Deep vein thrombosis can cause leg pain, but can also occur without any symptoms.
Deep vein thrombosis can develop if you’re sitting still for a long time, such as when travelling, if you have a muscle tear/strain, or if you have certain medical conditions that affect how your blood clots.
Deep vein thrombosis is a serious condition because a blood clot that has formed in your vein can break loose, travel through your bloodstream and lodge in your lungs, blocking blood flow (pulmonary embolism).
If your physiotherapist thinks that you may have a DVT they will send you either to A & E or to see your GP for further tests.