A sprained foot is medically referred to as a sprain, and trying to determine whether ligament damage has occurred after a sprain can be diagnosed by visual inspection, palpation, and imaging. Ligament injuries are usually caused by sudden violence or chronic strain, which can occur after a foot sprain. Patients mainly present with localized pain, swelling, bleeding in the tissues, hematomas, joint pain, impaired mobility, and pressure pain. If you want to determine whether the ligament is damaged after a sprain, you can first make a preliminary observation through visual inspection and palpation, and then combine it with ultrasound, MRI and other examinations to confirm the diagnosis. It is recommended that people with severe symptoms after sprains go to local regular hospitals for relevant examinations. If ligament injury occurs, you should actively cooperate with doctors for treatment to avoid delaying the condition and affecting your health.