Common causes of knee pain include:

  • Arthritis
  • Age-related wear and tear
  • Fractures
  • ACL injuries
  • Tendonitis
  • Bursitis
  • A torn meniscus
  • A dislocated kneecap

You might experience a knee injury from playing sports, falling down, or being in a car accident. Risk factors for knee pain include obesity, older age, previous injuries, and lack of flexibility or strength.