Pain on the outside of both feet can be caused by a disease of the foot itself or a disease of the nerves and blood vessels that innervate the foot. In addition, some systemic diseases can also cause pain. 1. Diseases of the foot itself: Diseases with obvious triggers, such as foot trauma leading to foot muscle strain, causing local nerve damage; bone spur growth or osteophytes, etc. leading to bone spurs; walking too much, leading to fatigue fracture or long time flat-footed standing and walking; no obvious triggers, such as foot inflammation, infections, tumors and so on, may lead to pain on the outside of the foot. 2. Diseases that innervate the nerves of the foot: such as trauma to the lower leg or other diseases involving the tibial nerve or common peroneal nerve, which can lead to sensory abnormalities and dysfunction in the innervated area. 3. Diseases affecting the blood circulation of the feet: such as vasculitis, atherosclerosis, embolism, trauma, etc., once the blood circulation of the feet is seriously affected, it may cause foot pain. 4. Systemic diseases: such as diabetic vasculopathy, gout, rheumatoid arthritis, etc. involved in the foot will cause foot pain. If the symptoms persist, you should go to the hospital in time, and standardize the treatment under the guidance of the doctor.