Patellofemoral pain syndrome is the most common cause of knee pain seen by doctors. It's common in people who participate in sports, especially women and young adults.
The most common symptom is knee pain that increases with stair climbing or squatting movements.
The primary treatment is rest. Pain relievers or physical therapy also can reduce pain.
Consult a doctor for medical advice
Sources: Mayo Clinic and others.
More than 3 million US cases per year
Treatable by a medical professional
Requires a medical diagnosis
Lab tests or imaging rarely required
Medium-term: resolves within months