When does a metatarsal stress reaction actually show up on imaging? In this episode of the Doc On The Run Podcast, Dr. Christopher Segler explains the difference between a stress response, stress reaction, and true stress fracture—and why timing matters when choosing X-rays, MRI, ultrasound, or CT scans. Learn how early imaging can help you make smarter race decisions, avoid false reassurance from a “normal” X-ray, and protect your fitness without turning a minor stress reaction into a full fracture.