The symptoms of swelling and pain in the feet of the elderly are commonly caused by the following: First, injury and strain, due to the aging of the body of the elderly, the body degeneration, including bone degeneration, muscle degeneration, as well as ligament and joint capsule degeneration, there is a decline in bone strength, muscle strength, stability and strength of action are also reduced, prone to injury and strain, resulting in local swelling and pain. 2. Elderly people often have other systemic diseases, such as renal insufficiency, cardiac insufficiency or diabetes, and renal insufficiency and cardiac insufficiency can easily lead to water and sodium retention in the body, resulting in swelling and pain in the feet, and diabetes can also lead to local swelling and pain. Third, it can be seen in infectious diseases, the elderly skin’s defenses are reduced, and in daily life the care of the elderly themselves is not very convenient, in the foot or the lower limbs of a minor injury, it is easy to secondary infection, the symptoms of local redness, swelling and heat pain.