Bilateral widening of the intermuscular veins in the calf means dilatation, thrombosis or a history of thrombosis. If the widening is simple, it is physiologic, i.e., the intermuscular veins are dilated and not caused by disease; it sometimes means that the blood is stagnant, which can be seen on ultrasound. If there is also an atheromatous or foggy echo, this means that the vein may be in the pre-thrombotic phase, which needs to be treated, and can be avoided by wearing compression stockings, applying topical air pressure waves, and appropriate anticoagulant medications, such as aspirin and warfarin, etc. Consult your physician for more information on the use of these medications. If a thrombus has formed in a tendon vein, and the thrombus is dissolved or dislodged, the intertendinous veins may widen on imaging, and the intertendinous veins may reflux blood, which may increase the pressure in the superficial veins, resulting in leg swelling or even superficial varicose veins. It is advisable to consult a specialist in a hospital for this condition.