Swelling of the dorsal tendon of the foot may be caused by trauma, and may also be caused by gout. 1. Trauma: the dorsum of the foot is relatively thin in subcutaneous fat, and the subcutaneous tissues, ligaments, blood vessels, etc., which are generally bony, and the ability to resist external forces is relatively poor, and it is very easy to be damaged after being subjected to external forces, which may result in the rupture of small blood vessels under the skin or inflammation, causing local congestion, edema and other symptoms, such as metatarsal avulsion fracture, tarsometatarsal joint dislocation, and so on. 2. Gout: when the body has hyperuricemia leading to gout, it is easy to cause accumulation in the hands, feet, knees and other parts of the body. When urate crystals are deposited in the small joints of the dorsum of the foot, it can lead to the emergence of immune complexes due to the perverse reaction of the body’s immune system with the urate crystals, resulting in the appearance of swollen and painful joints, and functional limitation of the joints and other manifestations. Swollen dorsal hamstring may also have other causes, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.