When the day is cold, some elderly people will feel numbness and swelling in their legs and feet soon after sitting down. What is the cause of this? In this case, some people may be suffering from lower limb vascular disease, that is, the veins of the lower limbs are blocked by some small thrombosis, resulting in poor blood return, resulting in swollen feet. In this case, you should go to the hospital for examination and treatment as soon as possible. As the saying goes, “old trees first old roots, old people first old legs”, to prevent lower limb vascular disease, the elderly should pay attention to exercise the lower limb muscles, such as playing shuttlecock is a good exercise for the lower limbs. You can also often do leg shaking exercise: a hand on the tree or wall, first forward shaking the calf, so that the toe forward, up; then backward shaking, the toe force backward, the foot surface taut, the leg is also straight, two feet in turn shaking, repeat 50-80 times is appropriate.