Overview
An ankle sprain is an injury to the ligaments that support the ankle joint, most often from a sudden twist or landing that rolls the foot inward. The ligament fibers can stretch and become painful, and in more severe cases they can partially tear. Because ligaments help stabilize the joint, a sprain can cause swelling, bruising, and a feeling of instability or "giving way." Pain often limits walking and can make the ankle feel stiff while it heals.
Symptoms
You may notice pain on the outer or inner side of the ankle after a twist, along with swelling that can appear right away or over the next day. Tenderness is usually present when pressing on the injured ligament area. Walking may be painful, and you might have difficulty bearing weight or doing stairs. Some people also report reduced range of motion and a sense that the ankle is unstable, especially when turning or changing direction.
Causes
An ankle sprain typically happens when the foot is forced out of its normal position, such as rolling inward during sports, tripping on uneven ground, or landing awkwardly. This mechanism stretches or tears the ligaments, leading to inflammation and pain. Severity depends on how much ligament fiber damage occurred and whether nearby structures were also stressed.
Risk Factors
Risk is higher if you have had a prior ankle sprain, because the ankle may not regain full strength and coordination after healing. Poor balance, weak supporting muscles, and limited ankle mobility can make it easier to twist again. Playing high-impact sports, working on uneven surfaces, wearing worn-out shoes, and fatigue can also increase the chance of injury.
Prevention
You can reduce risk by improving ankle strength, balance, and coordination with regular exercises, especially after a previous sprain. Using supportive footwear and replacing shoes that no longer provide adequate traction and cushioning can help. For sports or higher-risk activities, consider taping or a properly fitted ankle brace during early return to play. Gradual conditioning and avoiding sudden spikes in activity can also lower the chance of re-injury.
How the Diagnosis Is Evaluated
Clinicians usually start with a history of how the injury happened, where the pain is located, and whether you could bear weight afterward. A physical exam checks for swelling, bruising, tenderness over specific ligament areas, ankle range of motion, and stability testing. Imaging such as X-rays is often used to rule out fracture when certain Ottawa Ankle Rules criteria are met; MRI or ultrasound may be considered if symptoms suggest a more complex injury or if pain persists despite appropriate care.
Nonsurgical Treatment Options
Most ankle sprains improve with conservative care focused on pain control, protecting the injured ligament, and restoring function. Early management commonly includes relative rest, ice for pain and swelling, compression, elevation, and short-term use of an ankle brace or supportive wrap to limit harmful motion while still allowing safe movement. Over-the-counter anti-inflammatory medicines may help with pain if they are safe for you to use. A structured physical therapy program is often the most important step, emphasizing range-of-motion exercises, progressive strengthening, and balance or proprioception training to reduce instability and re-sprain risk. If pain and instability persist despite good rehabilitation, clinicians may consider additional interventions in selected cases, such as corticosteroid injections or biologic injections, while carefully evaluating for associated injuries.
When to Seek Medical Attention
Seek prompt medical attention if you cannot bear weight for several steps, if pain is severe, or if swelling and bruising are rapidly worsening. Get urgent evaluation for deformity, suspected fracture, or if there is numbness, worsening weakness, or a sudden loss of function. Contact a clinician soon if symptoms are not improving after several days of home care, or if you keep feeling the ankle give way during everyday activities.
Frequently Asked Questions
Mild sprains often improve within 1 to 3 weeks, while more severe sprains can take 6 to 12 weeks or longer, especially if instability remains.
Not every sprain needs imaging, but X-rays are recommended when specific criteria suggest a higher risk of fracture.
Next Steps
Start with supportive care and protect the ankle from movements that sharply increase pain, while beginning gentle motion as tolerated. If you cannot bear weight, have significant deformity, numbness, or worsening symptoms, get evaluated promptly. If pain, swelling, or instability persists beyond several days or interferes with normal walking, seek an in-person assessment to rule out associated injuries.