The cause of finger swelling needs to be differentiated between different parts or ranges. If there is unilateral finger or unilateral hand swelling, there is a possibility of trauma, inflammation, or unilateral vascularization of the upper extremity, and ultrasound of the corresponding area needs to be done to make a differential diagnosis. In case of bilateral finger swelling, the local cause is superior vena cava obstruction syndrome, which needs to be identified by appropriate imaging tests. If local causes are ruled out, then systemic causes can be identified. Among the systemic causes, there is a physiological abnormality rather than a pathological state, that is, drinking too much water before going to bed or women’s special period, such as menstruation, are prone to finger swelling, and when this special period is over, the finger swelling will disappear, and if we exclude the above causes, it is systemic diseases, such as cardiac disease and renal disease.