Lower Back Pain Halfway Through Your Run? Why It Starts at 6km and How to Fix It
Like the runner in the photo, you've had to stop mid-run, hands pressed into your lower back. You set off for your 10km, morning or evening, feeling fresh. Around 4 or 5km, one hip starts to feel tired and heavy. By 6km, a dull ache creeps into your lower back. By the last few kilometres you're tight across the back, and maybe your shoulder or neck is aching too. You finish, stretch, and feel fine by the next day. Then the same thing happens on your next run.
If that's you, your back isn't the real problem. It's tired hip muscles.
Why your back hurts late in the run
Every running stride is a short hop on one leg. The muscle on the side of your buttock (glute medius) keeps your hips level on each landing. If it's weak on one side, it tires first. Your hip then starts to drop with each step, and your lower back muscles have to work extra hard to hold you upright. For the first few kilometres they cope. By 6km they're tired, and the pain kicks in.
Why your shoulder or neck hurts too
Your body works in a chain, not in parts. Two patterns are common:
- Opposite side: your hip and the opposite shoulder are linked by muscles that cross your back like an X. If your right hip tires, your left shoulder and back work harder to keep you balanced, so that side starts to ache.
- Same side: if your right hip is weak, you may lean or tense up on the right, so your right side of the back, shoulder and neck tighten as you fight to stay upright.
Either way, the pain shows up far from where the weakness started.
Signs this is your problem
- One hip feels tired or heavy before the back pain starts
- Back pain comes late in the run, not at the start
- Shoulder or neck tightness on one side during longer runs
- Pain eases with rest, then returns every long run
- Your hip drops or your body sways side to side (ask a friend to film you)
How Katasi Physiotherapy helps runners
We test your hip, back and core strength on each side, and watch how you run. Then we ease the tight, painful muscles with hands-on treatment and dry needling, and give you a short strength plan for your hips and core that fits around your training. Most runners can keep running while they recover, with some changes to distance or pace.
Read more: Painful, Tight Muscle at the Side of Your Hip? and Ran the Nairobi Marathon? Normal Soreness vs. an Injury
See a doctor first if
Back pain stays even at rest or at night, comes with numbness or weakness in your legs, or you have chest pain or unusual breathlessness while running.
Book in Westlands
Run the whole 10km without your back giving up at 6. Visit Katasi Physiotherapy at Kerai Office, Mogotio Road off Muthithi Road, Westlands, Nairobi. Call or WhatsApp 0705 717 353 to book. Open Monday to Friday 7am–6pm and Saturday 8am–4pm.