Lower back pain from running: common causes and how to prevent it

Lower back pain isn't among the most discussed running injuries — attention usually goes to knees and ankles — but it's a common complaint, especially for runners increasing their training volume or running with an inefficient posture. Understanding what causes it helps you tell a passing ache tied to a bad habit from a signal that deserves closer attention.

A weak core: the most frequent cause

Running loads the spine with every footstrike, and it's the deep abdominal muscles and the lower-back muscles that stabilize the pelvis with each stride. An untrained core leaves more of the work to the lower back, which compensates by tightening up — especially in the final kilometers of a long run, when fatigue erodes posture. A few minutes of core work two or three times a week, even simple planks and their variations, noticeably reduces this kind of overload.

Posture and running form

A stride with the torso leaning too far forward, or conversely too stiff and upright, puts more load on the lower back with every step. Running with relaxed shoulders, eyes toward the horizon rather than your feet, and a slight forward tilt of the pelvis helps distribute load more evenly along the whole kinetic chain, from ankle to back.

Shoes and surface

Worn-out shoes, or ones that don't match your foot strike, can alter running biomechanics and send more vibration up toward the back. The same goes for always running on the same side of a cambered road, a common mistake that loads the pelvis and spine asymmetrically. Our guide on how to choose running shoes can help you get this right.

Increasing mileage or intensity too quickly is probably the most common cause of running-related back pain: tissues simply don't have time to adapt to the new load. The general rule of not increasing weekly volume by more than roughly 10% over the previous week remains a reasonable guideline, along with periodic deload weeks to let tissues recover.

When to see a professional

Mild lower-back discomfort that improves with rest and some mobility work falls within normal self-management. Pain that radiates down the leg or into the glute, that doesn't improve after a week of active rest, or that appears suddenly after a specific effort deserves an evaluation from a professional (a physiotherapist or sports doctor), since it can point to causes beyond simple muscular overload.

Everyday prevention

Beyond specific exercises, small daily habits help too: not sitting for too many hours without a break, doing light stretching after running and not just before, and looking after sleep, the time when tissues actually repay the load they've accumulated. For more on recovery, our guide on what to do in the 24-48 hours after a hard effort covers this in more depth.

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