Edema can be judged by pressing the swollen area with your finger. If there is a depression after releasing it, it means it is obvious edema. Mild edema can be significantly improved by resting and eating diuretic foods, and common winter melon and watermelon are good edema-removing foods. Severe edema may be caused by organ lesions in the body, so it is necessary to go to the hospital for timely examination to check whether there are diseases of the heart, liver, kidney and thyroid gland, etc. After finding the relevant diseases, corresponding treatment should be carried out, and attention should be paid to avoid eating too salty and greasy food.