Medically reviewed by Dr. Jeffrey Peng, MD — Board-Certified Sports Medicine Physician Published: March 1, 2026 | Last Updated: March 1, 2026 Knee pain is one of the most common complaints I see in my sports medicine practice. While occasional soreness after exercise is usually nothing to worry about, there are certain warning signs that should prompt you to seek evaluation sooner rather than later. After treating thousands of patients with knee pain, I've identified three c