The swelling of the patient’s feet at night, which disappears in the morning, is commonly associated with lower limb vascular reflux disorders and serious internal diseases, as follows: First, lower limb vascular reflux disorders: lower limb vascular reflux disorders include both lower limb varicose veins and leg muscle atrophy, both of which can lead to lower limb venous reflux disorders. Patients will have swollen feet after standing work during the day, while after resting at night, the venous return will return to normal and the swollen feet will disappear completely in the morning. Second, serious medical diseases: serious medical diseases, such as cardiac insufficiency and renal insufficiency, are also prone to foot swelling during the daytime work, and the swelling of the feet will gradually subside when the heart function and kidney function, to a certain extent, are restored in the morning. Therefore, if patients have swollen feet at night and the swelling disappears in the morning, they should pay high attention to actively investigate related diseases and treat them as soon as possible after diagnosis, which can relieve clinical symptoms.