Ankle sprains are common injuries that can happen during sports, exercise, or everyday activities. A sprain occurs when the ligaments that support the ankle stretch too far or tear. It can take only a second to happen, but the effects can linger for weeks.
Awkward landings, twisting movements, and uneven surfaces are among the most common causes. It helps to separate the moment an injury happens, such as rolling the ankle, from the factors that make it more likely, such as a previous sprain, poor balance, or unsuitable footwear.
This guide explains what causes ankle sprains, covers seven common reasons with a practical prevention tip for each, and describes when to seek medical attention. Not every sprain can be prevented, but understanding the causes can help you lower your risk.
For related reading, see our guides on ankle sprain risk factors and ankle sprain treatment options.
What Is an Ankle Sprain?
Ligaments are strong bands of tissue that connect bones and keep a joint stable. In the ankle, they help hold the foot in position as you walk, run, and change direction. A sprain happens when the ankle rolls, twists, or turns beyond its normal range and the ligaments are stretched or torn.
Many sprains affect the ligaments on the outside of the ankle. The American Academy of Family Physicians (AAFP) explains that most ankle sprains are inversion injuries to the lateral ligaments. Mayo Clinic describes common sprained ankle symptoms and causes, including pain, swelling, bruising, tenderness, and difficulty bearing weight.
An ankle sprain can look a lot like a fracture or another injury. Symptoms alone should not be used to diagnose the problem, so an appropriate assessment matters, especially when symptoms are significant.
What Causes Ankle Sprains? 7 Common Reasons
1. Rolling or Twisting the Ankle Suddenly
The most direct cause of a sprain is a sudden roll or twist. The foot can turn inward or outward unexpectedly, which stretches or tears the supporting ligaments.
Common situations include missing a step, tripping, or changing direction suddenly. This can happen during everyday movement, not only during sports.
Prevention tip: Pay attention to your footing, move cautiously on unfamiliar terrain, and avoid rushing over obstacles.
2. Landing Awkwardly After a Jump
Landing with the foot at an awkward angle can place too much stress on the ankle ligaments. This often happens when jumping and rebounding, such as after a volleyball or basketball play. Landing on another person’s foot can also cause a sprain.
Mayo Clinic notes that falls and awkward landings are among the ways ankles are injured.
Prevention tip: Practice controlled landing mechanics and build jumping skills progressively.
3. Playing Sports That Involve Quick Direction Changes
Pivoting, cutting, sprinting, and sudden stops can force the ankle beyond its normal range of movement. Examples include basketball, soccer, tennis, football, and trail running.
Playing these sports increases exposure to such movements, but it does not mean an injury is inevitable. Conditioning, technique, and past injuries all play a role.
Prevention tip: Warm up, develop sport-specific strength and coordination, and practice changing direction with control.
4. Walking or Running on Uneven Surfaces
Loose gravel, uneven trails, potholes, wet floors, and poorly maintained playing fields can make the foot land unpredictably. This applies to everyday walking as well as outdoor exercise. Mayo Clinic lists walking or exercising on an uneven surface as a risk factor.
An uneven surface is an immediate hazard. It is different from personal factors, such as weak muscles or a previous injury, that may make some people more susceptible.
Prevention tip: Watch where you step, choose appropriate footwear, and adjust your pace to the terrain. Our guide on safe walking habits offers general advice for staying active.
5. Having a Previous Ankle Sprain
A previous sprain is an important risk factor for another one. The AAFP notes that a history of ankle sprain is a common risk factor for later injury.
This may reflect persistent weakness, reduced balance, or ankle instability after incomplete recovery. Returning to sport before rehabilitation is complete can be a problem for the same reason.
Prevention tip: Follow a suitable rehabilitation program, and regain strength, balance, and functional ability before returning to demanding activities. It also helps to support recovery after exercise with good rest and sleep habits.
6. Weak Ankle Muscles or Poor Balance
Strength, coordination, and balance help the body respond when the foot lands in an unexpected position. Weak ankle and lower-leg muscles, or reduced balance, may make it harder to react in time. Limited ankle flexibility or poor movement control may also contribute for some people.
Balance and stability training can help reduce the risk of repeat sprains, especially in people who have had one before. The evidence for preventing a first sprain is less certain.
Prevention tip: Gradually build ankle and lower-leg strength, and add appropriate balance exercises to your routine. You can build strength safely by progressing slowly.
7. Wearing Unsuitable Footwear or Having Inadequate Ankle Support
Poorly fitting shoes, worn soles, slippery footwear, and shoes that do not suit the activity can affect traction and stability. Mayo Clinic lists shoes that do not fit properly or are not appropriate for an activity as a risk factor.
Some people with a previous sprain may benefit from a brace or taping during higher-risk activities. This should follow professional guidance.
Prevention tip: Wear well-fitting shoes suited to the activity, and consider professional advice about ankle support if sprains recur.
How to Prevent Ankle Sprains
Prevention works best as a combination of good preparation, suitable equipment, awareness of your surroundings, and complete rehabilitation after any injury. No single step guarantees protection. These habits may lower your risk:
- Warm up before exercise or sports.
- Build ankle and lower-leg strength gradually.
- Practice balance and coordination exercises.
- Wear suitable, well-fitting footwear.
- Be cautious on uneven or slippery surfaces.
- Use appropriate landing and direction-changing techniques.
- Complete rehabilitation after a previous sprain.
- Ask a healthcare professional whether a brace or taping is appropriate if you have a history of ankle sprains.
General mobility work can also help; see our guide to improve flexibility and mobility. Remember to allow time for recovery between hard sessions. The AAFP notes that braces, lace-up supports, and athletic taping can reduce the risk of ankle sprains during sports.
When Should You Seek Medical Attention?
Not every painful or swollen ankle is a simple sprain. Seek prompt medical assessment if you have:
- Severe pain or swelling
- An ankle that looks deformed
- Numbness or unusual loss of sensation
- Significant tenderness over the bone
- An inability to bear weight or walk
Also ask a clinician about recurring sprains, persistent ankle instability, or symptoms that are not improving. A clinician can decide whether further evaluation is needed to rule out a fracture or another injury. Mayo Clinic explains when to see a doctor for a sprained ankle, and the American Academy of Orthopaedic Surgeons offers patient information on ankle sprains.
Frequently Asked Questions About Ankle Sprains
What is the most common cause of an ankle sprain?
Ankle sprains commonly happen when the foot rolls, twists, or turns awkwardly, placing excessive stress on the supporting ligaments. This can occur during sports or everyday movement. The AAFP notes that most sprains involve inversion of the ankle, or rolling the foot inward.
Can walking cause an ankle sprain?
Yes. A misstep, trip, or unexpected movement on uneven ground can cause an ankle sprain, even without sports or vigorous exercise. Watching your footing and wearing suitable shoes can help, though no step eliminates the chance of a roll.
Why do ankle sprains keep happening?
Several factors may contribute. These include a previous injury, lingering ankle instability, reduced strength or balance, and incomplete rehabilitation. If your ankle keeps giving way, a clinician or physical therapist can assess what may be involved and suggest a plan.
Do certain sports increase the risk of ankle sprains?
Yes. Sports involving jumping, pivoting, sudden stops, and rapid direction changes can increase exposure to ankle-twisting movements. Mayo Clinic names basketball, tennis, football, soccer, and trail running as examples. Risk still varies from person to person.
Can ankle exercises help prevent sprains?
Strength and balance exercises can support ankle function and may help reduce the risk of recurrent sprains. The right exercises depend on your ability and injury history, so ask a clinician or physical therapist if you have had a significant injury.
What shoes are best for preventing ankle sprains?
Choose well-fitting footwear made for your activity, with suitable traction and support. Replace shoes that are heavily worn. No shoe can eliminate sprain risk, so footwear works best alongside strength, balance, and careful movement on uneven ground.
How can I protect my ankle after a previous sprain?
Complete a suitable rehabilitation program and return to activity gradually. A healthcare professional can advise on balance training, strengthening, and whether bracing or taping makes sense for you. Our guide to ankle sprain treatment options covers recovery in more detail.
Conclusion: Understanding and Preventing Ankle Sprains
The seven common causes are sudden rolls or twists, awkward landings, sports with quick direction changes, uneven surfaces, a previous sprain, weak muscles or poor balance, and unsuitable footwear or support. The most useful prevention steps are suitable footwear, careful movement on uneven surfaces, strength and balance training, and proper recovery after an injury.
If you have recurring instability or suspect a significant injury, consult a healthcare professional.
Sources
- Mayo Clinic. Sprained ankle: Symptoms and causes
- Mayo Clinic. Sprained ankle: Diagnosis and treatment
- American Academy of Orthopaedic Surgeons, OrthoInfo. Sprained Ankle
- American Academy of Family Physicians. Update on Acute Ankle Sprains
- American Academy of Family Physicians. Acute ankle injury article (American Family Physician, November 2006)
Medical Disclaimer: This article is for informational purposes only and is not a substitute for professional medical advice. Always consult a doctor or physical therapist for proper diagnosis, treatment, and prevention strategies for ankle sprains.
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