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Hip flexor pain when running: causes and treatment

You’re a few kilometres into your run and you feel it — a tight, pulling ache at the front of your hip or deep in the groin. Maybe it’s been building for weeks. Maybe it came on suddenly during a hill repeat. Either way, it’s annoying, it’s slowing you down, and you’re not sure whether to push through or stop.

Hip flexor pain is one of the most common complaints in runners who are building mileage, returning after a break, or spending long hours sitting at a desk before lashing on their trainers after work. The frustrating part is that it often doesn’t feel dramatic enough to take seriously — until it becomes a proper injury that sidelines you for weeks.

This article covers the main causes, how to tell what you’re dealing with, and what actually helps — not just “stretch more and rest”, but specific steps you can take to manage the pain, keep training where possible, and stop it coming back.

What are the hip flexors and why do runners hurt them?

The hip flexors are a group of muscles responsible for lifting your knee towards your chest — which is, of course, exactly what you do with every single stride when you run. The main players are the iliopsoas (iliacus and psoas major), the rectus femoris (part of your quad), and the tensor fasciae latae (TFL).

When any of these are overloaded, tight, or weak, you get pain at the front of the hip, deep in the groin, or occasionally radiating down the thigh. The pain can feel like a dull ache, a sharp pinch at the top of the stride, or a stiffness that eases off after a kilometre or two — but often returns after you stop running.

Runners are particularly vulnerable for two reasons. First, running loads the hip flexors thousands of times per outing. Second, most of us spend significant time sitting — at desks, in cars, on sofas — which keeps the hip flexors in a shortened position and gradually reduces their capacity to handle load.

Common causes of hip flexor pain when running

Not all hip flexor pain is the same. The cause shapes the treatment, so it’s worth narrowing down what’s actually going on.

If the pain came on suddenly — mid-run, mid-sprint, or during a hard effort — treat it as a strain and don’t try to run through it. If it’s been creeping up gradually over weeks, you’re more likely dealing with tendinopathy or overuse, which responds well to load management rather than complete rest.

How to tell if it’s serious

Most hip flexor pain in recreational runners is muscular overuse and responds to conservative treatment within 2–6 weeks. But there are a few signs worth taking seriously:

• Pain that doesn’t ease at all after 10 minutes of running (and worsens as you continue)
• Sharp, catching pain deep in the groin, especially when you rotate the hip inward — this can indicate hip impingement or labral issues
• Swelling, bruising, or a sudden “pop” at the time of injury (possible muscle tear — stop running immediately)
• Pain that radiates down the inside of the thigh with weakness — can sometimes be referred from the lumbar spine
• No improvement after 4–6 weeks of sensible load management and rehab

If any of these apply, see a sports physio before continuing to train. The NHS guidance on hip pain recommends professional assessment if pain is severe, persistent, or accompanied by stiffness that makes walking difficult.

Treatment: what actually helps

In the first 48–72 hours after acute pain

If the pain came on suddenly, treat the first two days conservatively:

• Stop running — not forever, just for now
• Apply ice (wrapped in a cloth) for 15–20 minutes, 3–4 times a day
• Avoid deep hip flexor stretching immediately after a strain — it can aggravate an already irritated tissue
• Keep moving gently; walking is fine and preferable to total rest

Gradual return to load (the bit most people skip)

Complete rest is rarely the answer for tendon or muscle overuse issues. What actually helps is graded loading — controlled exercises that progressively stress the tissue so it adapts and gets stronger.

A basic progression over 4–6 weeks:

1. Week 1–2: Isometric holds — standing hip flexion holds (lift the knee and hold for 30–45 seconds, 3 sets)
2. Week 2–3: Slow eccentric step-ups and split squats — control matters more than load
3. Week 3–4: Resistance band hip flexion drills — seated or standing
4. Week 4–6: Return to easy running, starting at 20–30 minutes at a comfortable pace (roughly 6:00–7:00/km for most recreational runners), 3 times per week

If pain increases above a 4/10 during or after any of these steps, stay at that stage longer rather than pushing forward.

Stretching and mobility: helpful, but not a cure

Stretching has a role, but it won’t fix a hip flexor problem on its own — especially if underlying weakness or poor mechanics are the root cause.

The hip flexor lunge stretch is the classic one: kneel on one knee, push the hips forward gently, hold for 30–45 seconds, repeat 2–3 times per side. Done daily, it helps maintain range of motion.

Foam rolling the quads and TFL can also reduce perceived tightness. If you’re not already using a foam roller as part of your recovery routine, it’s worth considering — but manage your expectations. Rolling doesn’t lengthen muscle tissue in any meaningful long-term sense; it reduces sensitivity and helps you move more freely in the short term. That’s still useful. (You can find a breakdown of which foam rollers are worth your money in our guide to best foam rollers for runner recovery.)

Hip mobility work — particularly 90/90 stretches, pigeon pose, and controlled hip circles — also helps if stiffness is a contributing factor.

Addressing the running mechanics behind the pain

If your hip flexors are taking too much of the load, something upstream or downstream is probably underperforming. The usual suspects:

Weak glutes: If your glutes aren’t firing properly, your hip flexors compensate. Single-leg glute bridges and lateral band walks 2–3 times per week can make a noticeable difference within 4–6 weeks.

Low cadence: If you’re overstriding — landing your foot well ahead of your centre of mass — you increase hip flexor demand with every step. A cadence of around 170–180 steps per minute tends to reduce overstriding. If you’re currently at 155–160, even a 5% increase can reduce impact and load on the hip. Our article on how to improve running cadence covers this with practical drills.

Anterior pelvic tilt: Many runners (particularly those with desk jobs) run with an exaggerated forward pelvic tilt, which puts the hip flexors in a shortened, stressed position throughout the gait cycle. Core strengthening — particularly dead bugs, hollow holds, and plank variations — helps restore neutral pelvic position.

Research published in the Journal of Athletic Training supports the link between hip muscle weakness and running-related injuries, reinforcing that targeted strengthening — not just stretching — is the more effective long-term intervention. See the research summary here.

Can you keep running with hip flexor pain?

This is the question most runners actually want answered. The honest answer: sometimes yes, sometimes no — and the pain during and after the run is your guide.

You can generally continue easy running if:
– The pain is 3/10 or below during the run
– It doesn’t worsen as the run progresses
– You’re not significantly altering your gait to compensate
– Pain levels return to baseline within 24 hours of running

You should stop and reassess if:
– Pain is above 4–5/10 and climbing during the run
– You’re limping or noticeably compensating
– Pain is worse the following morning than it was the day before
– It’s been more than 6 weeks with no improvement

Staying active — but modifying the load — is usually more productive than complete rest. Swap a planned 10km run for a 25-minute easy jog. Cut your intervals session to easy running only. Take the hills out of your route. These aren’t failures; they’re sensible adjustments that keep the body moving while letting tissue recover.

Prevention: what to do when you’re not injured

The best time to deal with hip flexor problems is before they happen. A few practical habits that make a real difference:

• Warm up properly: 5 minutes of dynamic movement — leg swings, walking lunges, hip circles — before every run reduces the shock of sudden load on cold tissue
• Don’t ramp mileage too fast: The 10% rule (don’t increase weekly mileage by more than 10% week-on-week) isn’t perfect, but it’s a reasonable guardrail
• Build in genuine easy days: If every run is at the same moderate-hard effort, you’re never giving your hip flexors time to recover. Easy runs and recovery runs serve different purposes — understand both
• Strengthen, don’t just stretch: 15–20 minutes of hip and glute strengthening, twice a week, is one of the most effective things an everyday runner can do to stay injury-free

The honest takeaway

• Hip flexor pain is usually a load management issue — doing too much, too soon, with too little strength in the supporting muscles. Rest alone rarely solves it.
• Gradual loading — not stretching, not foam rolling alone — is the core treatment. Work through a 4–6 week progression of isometrics, eccentric exercises, and graded running return.
• Check your mechanics: weak glutes, low cadence, and anterior pelvic tilt are common contributors. Fix those and the hip flexors stop having to compensate.
• Pain above 4/10 during a run, or any sharp catching deep in the groin, means see a physio — don’t guess your way through it.
• Prevention is simpler than treatment: warm up properly, increase mileage gradually, and do basic hip and glute strength work twice a week. It takes 20 minutes. It’s worth it.

Next read: How to stay injury free during marathon training