Ankle is not swollen but walking is painful may be related to trauma, ankle joint lesion, lumbar disc herniation, tumor, infection and other reasons. Trauma such as walking accidentally broken foot, ankle sprain, etc., due to the damage is light, capillary bleeding is not much, soft tissue damage is light, there will be no swelling of the ankle, when walking the damaged structure is pulled, it will cause obvious pain. Ankle joint lesions such as ankle osteoarthritis, rheumatoid arthritis, talar cystic disease, etc., usually do not have obvious swelling, but when walking the ankle joint rubbing against each other will cause obvious pain. Herniated lumbar intervertebral disc compresses the nerve root innervating the lower limbs, and the ankle is not swollen but walking is painful, mostly accompanied by numbness and other sensory abnormalities in the lower limbs. Early stage of tumor in calf and ankle will also show the symptom of walking pain without swelling of ankle. When the ankle is infected due to trauma or other reasons, the symptoms of no swelling but painful walking may also appear when the infection is mild. If there is no swelling of the ankle but the pain when walking persists, it is recommended to go to the hospital in time, complete the relevant examinations, clarify the cause of the disease and follow the doctor’s instructions to carry out regular treatment, so as to avoid delaying the condition.