If the leg is swollen during the day and decreases at night, the treatment should be based on different causes: 1. If the leg is swollen due to prolonged standing or sitting due to work, it is recommended to take hot water to soak the feet at home at night to promote blood circulation in the lower limbs, and elevate the affected limbs when sleeping to facilitate blood flow back to achieve the purpose of decreasing swelling. 2. For example, if the swelling is caused by kidney disease, you can use diuretic drugs such as furosemide and hydrochlorothiazide to achieve the purpose of diuresis and swelling, but also according to the original disease to treat, if the combination of proteinuria patients can use the drugs such as priligy or sartan (under the exclusion of contraindications) to reduce urine protein, so as to achieve the purpose of swelling. 3. If the swelling is caused by idiopathic edema and there is no clear treatment, the swelling can also be reduced by rest and additional sleep.