There are many reasons why the feet may be swollen, relatively speaking, the more common ones in clinical practice are heart failure, hypothyroidism, gout, diabetic foot, renal insufficiency, hypoalbuminemia, all of these patients may have edema of the feet. In addition, some patients may be taking special drugs, which may also indirectly lead to foot edema, for example, some patients may take glucocorticoids, or take calcium channel blockers, especially hypertensive patients taking oral felodipine, amlodipine, such drugs will lead to foot and ankle edema. When patients develop foot edema, it is important to identify the cause so that a better medication plan can be formulated to prevent the appearance of lower limb edema. If it is triggered by heart failure, it may be necessary to combine diuresis and vasodilatation for improvement. Patients are advised to check BNP, liver function, kidney function, and cardiac ultrasound, and these preliminary screenings can help further clarify what the cause of foot edema is.