Sitting in a car for a long time can lead to swelling of the lower limbs, which is medically known as traveler’s edema. Therefore, when riding in a car, do not always sit, you should always change your position, or stand for a while or elevate the lower limbs to sit for a while, you can also use your hands to massage the lower limbs from top to bottom to help blood flow back. Traveler’s edema is mostly seen in people over 40 years old and fat people, and is more common in women, and it is a kind of benign edema. It manifests as numbness, swelling and heaviness in the hands and feet, and edema is more common in the two lower extremities and is looser, and the hands are often involved; it is mostly mild edema and has little relationship with water intake; it can disappear completely after rest and position change, and often disappears in the morning and appears in the afternoon. How to check for edema in travelers? Edema is often one of the important manifestations of certain diseases and can be caused by as many as 30 different causes, the most common being caused by heart, liver and kidney diseases. However, in some patients with edema, no abnormal findings are found through various examinations and laboratory tests, and after long-term observation, the health of these people is not significantly affected. In view of the fact that the causes and nature of such edema are not well understood, it is medically called benign edema, also known as functional edema. It is associated with increased aldosterone secretion during uprightness, leading to increased water and sodium reabsorption by the renal tubules. It is more common in women and may be related to endocrine disorders; it is often seen in obese people because of the need to rely on peripheral vasodilatation to distribute body heat, which leads to an increase in venous pressure in the lower extremities and an increase in capillary filtration pressure. Travelers edema as long as you stop traveling, 2-3 days to recover, no need to treat with drugs. Sometimes the salt intake can be appropriately restricted, water does not necessarily need to be strictly controlled, when the edema is significant, a small amount of dihydrocotrimoxazole can be used, each time 25mg (1 tablet) twice a day, and the edema can subside after a series of days.