Runners often misdiagnose knee and hip pain, attributing it to leg injuries. However, sudden, severe pain may originate from the upper lumbar spine, according to Joe Uhan, a physiotherapist.

Uhan explains that upper lumbar spine issues can cause pain in the hip, anterior thigh, and knee, often without lower back pain. This pain can be severe, sudden, and unresponsive to standard care. Read more racing coverage.

Neurogenic pain from the upper lumbar spine can mimic joint pain, making diagnosis challenging. Runners should consider lumbar spine imaging if they experience unexplained, severe leg pain. Related: Engelhard and Beaudoin Rousseau triumph in Quebec World Cup opener.

This original Runner World brief is based on reporting from iRunFar. Visit the source for its complete reporting, context and any later corrections.