The underlying cause of edema is the accumulation of excess water in a part of the body that cannot be absorbed and utilized through blood circulation for a period of time. In the case of swollen legs, there is a large amount of water accumulated in the legs, which cannot be dissolved through the patient’s own blood circulation or absorption. Since the age, physical condition and diet of different patients vary, they can be analyzed in the following categories. For example, if the heart, kidneys or liver are suffering from diseases themselves and the swelling is a complication of a certain disease, for swelling in this case, the patient is advised to promptly feedback the symptoms of swelling to the treating doctor to adjust the medication or treatment plan. If the patient has recently had an irregular diet or overworked in life, the symptoms of swelling may also arise. It is recommended to eat a light diet with less salt and low fat, and to maintain adequate water intake. If the patient does not belong to the above situation, but has persistent leg edema or the degree of edema is more serious, it is recommended to seek medical advice, check the physical condition and follow the medical advice for treatment with medication.