The swelling of the right foot can be caused by both physiologic and disease factors. Physiological factors are mostly seen in prolonged standing or heavy labor, while disease factors are seen in acute and chronic injuries, venous thrombosis of the right lower extremity, foot infections and so on. 1. Physiological factors: If the swelling of the right instep is not accompanied by other obvious symptoms, and if the patient has experienced standing for a long period of time or heavy labor, it may be due to the poor venous blood return of the lower limbs caused by the above reasons, resulting in swelling of the right instep. 2. Disease factors (1) Acute injury and chronic strain, due to acute violent injuries, such as strains, contusions, sprains, or heavy objects, can lead to localized symptoms of injurious swelling. (2) Right lower extremity venous thrombosis: If the right foot is swollen unilaterally, it may be due to poor circulation in the right lower extremity caused by right lower extremity venous thrombosis, which also requires medical treatment as soon as possible. (3) Infections that can be seen in the foot, including fungal infections, bacterial infections, etc., can lead to swelling due to infectious inflammation. The causes of swelling of the right foot surface are very complicated, which need to be combined with the patient’s accompanying symptoms, improve the relevant examination under the guidance of the doctor, to clarify the cause of the disease, so as to systematically treat.