If a patient wakes up with swollen legs, different treatment is usually given according to different reasons, as follows: 1. The patient takes in too much water at night, resulting in more obvious water and sodium retention. Reduce water intake at night, especially to avoid a large amount of water in one gulp; 2. If the leg swelling is caused by heart failure, the patient may wake up with swollen legs in the morning if he has underlying heart disease, which is related to the precursor of heart failure. Patients are advised to reduce water intake to avoid increased burden on the heart; 3. Hypothyroidism leads to water and sodium retention, which is a kind of generalized swelling, such as facial swelling, leg swelling, and even pericardial effusion and pleural effusion in some patients. In addition to leg swelling, this condition is accompanied by many uncomfortable symptoms, such as chest suffocation, facial swelling, and a feeling of suffocation. 4. Edema caused by renal insufficiency, patients not only have edema at night, but also during the day, accompanied by a decrease in urine output and other related manifestations. For heart, kidney and thyroid function problems, patients are advised to go to the hospital in time to avoid delaying their condition.