Hip Flexor Strain: Causes, Symptoms, and How We Can Help
- staystrongtherapy
- Jun 30
- 5 min read
All information in this blog is supported by peer-reviewed research. There is currently no dedicated NICE guideline for this condition, so current evidence is used throughout. Reference numbers appear throughout, with the full list at the bottom of the page.
What Is a Hip Flexor Strain?
A hip flexor strain is an injury to one of the muscles responsible for lifting the leg toward the body, most commonly the iliopsoas (the primary, deep hip flexor) or the rectus femoris (the front of the quadriceps, which also crosses the hip joint). These two muscles are anatomically distinct and respond differently to treatment, which is why an accurate assessment matters. ¹
Hip flexor strains typically occur in one of two ways. Rapid eccentric overload happens when the muscle is forcefully lengthened while contracting, the classic mechanism in sprinting, kicking, or explosive jumping. The hip flexors are placed under their greatest load during the late swing phase of sprinting, where the leg swings backward and the hip extensors fire, while the hip flexors must simultaneously control that lengthening movement eccentrically. Repetitive stress is the other mechanism, where chronic overuse from repeated hip flexion, such as long-distance running, cycling, or rowing, leads to accumulated microtrauma over time rather than a single injury moment. ¹
Common Signs and Symptoms
Pain at the front of the hip or groin, sometimes spreading into the thigh
Pain on lifting the leg, particularly against resistance
Sharp pain at the moment of injury in acute cases, or a more gradual ache in overuse presentations
Weakness when attempting to flex the hip
Tenderness on palpation of the front of the hip
Risk Factors
Sprinting, kicking sports, and explosive jumping, the classic mechanism for acute strains
Repetitive hip flexion activities, including long-distance running, cycling, and rowing, more associated with gradual overuse presentations
Previous hip flexor strain, recurrence is genuinely common, occurring in 30 to 40% of cases where underlying hip strength deficits and proper return-to-sport criteria aren't addressed ¹
Hip and groin muscle strength deficits, athletes with hip or groin pain frequently demonstrate impairments in hip muscle strength that need to be specifically addressed during rehabilitation ²
Reduced hip flexor flexibility, recognised as a contributing risk factor across related lower limb strain injuries ³
How Severe Is It? Understanding the Grading System
Hip flexor strains are graded similarly to other muscle strains:
Grade 1 (mild): typically resolves in 1 to 3 weeks with proper rehabilitation
Grade 2 (moderate): typically takes 4 to 8 weeks to recover
Grade 3 (severe, complete tear): may require surgical consultation ¹
Understanding the grade matters significantly for treatment, particularly because passive stretching alone can actually make Grade 2 and 3 strains worse, the muscle needs progressive loading, not just lengthening, to recover properly. ¹
What to Look Out For
Please seek medical assessment if you experience:
A visible deformity or significant bruising following acute injury, suggesting a more severe tear
Inability to bear weight or significant difficulty walking
Sudden, severe pain with an audible pop at the time of injury
Lower back pain alongside hip flexor symptoms, since the iliopsoas attaches to the lumbar spine, this combination warrants thorough assessment
Fever or feeling generally unwell alongside hip pain
Myths vs Facts
"I should just stretch it out." For Grade 2 and 3 strains particularly, passive stretching alone can worsen the injury. The muscle needs progressive, controlled loading rather than simply being lengthened. ¹
"Once the pain settles, I'm ready to return to sport." Pain-free walking does not mean you're ready to sprint. Sport-specific testing before return is genuinely important, and recurrence rates of 30 to 40% are linked specifically to skipping proper return-to-sport criteria and underlying strength deficits. ¹
"It's just my hip flexor, nothing else is connected." The iliopsoas has attachments along the lumbar vertebrae, meaning hip flexor problems can genuinely relate to, or present alongside, lower back symptoms, which is why a thorough assessment considers the whole region.
How We Can Help
Osteopathic manual techniques and manual therapy: used to address restriction and compensatory tension around the hip, pelvis, and lower back, supporting overall recovery alongside an active rehabilitation programme.
Deep tissue and sports massage: targeted soft tissue work for the hip flexors and surrounding muscles, used appropriately according to the stage and grade of injury.
Medical acupuncture and cupping: used as part of a broader treatment plan to support pain management during rehabilitation.
Accurate grading and assessment: identifying whether the iliopsoas or rectus femoris is the primary structure involved, and the grade of injury, to guide an appropriately paced recovery plan.
Exercise and Rehabilitation: The Cornerstone of Recovery
Progressive, graded loading is genuinely central to hip flexor strain recovery, not passive rest or stretching alone.
Isometric hip flexion holds: appropriate in the early stage, building tolerance without dynamic movement.
Progressive eccentric loading: gradually reintroducing controlled, lengthening contractions of the hip flexor, directly addressing the mechanism most strains occur through.
Hip and core strengthening: addressing the broader strength deficits research consistently links to both initial injury risk and recurrence. ²
Sport-specific and functional testing: before any return to running, cutting, or sprinting, ensuring the hip flexor can tolerate the specific demands of your sport, not just walking comfortably.
Graded return to sport: a structured, criteria-based progression, rather than a fixed timeline, reflecting how recurrence is so closely linked to premature return. ¹
Your practitioner will guide a programme tailored to the grade and structure involved, with sport-specific progression where relevant.
What to Expect at Your First Appointment
We will take a thorough history, including the mechanism of injury or pattern of symptoms if this developed gradually, and carry out a hands-on assessment to identify which hip flexor structure is involved and the grade of strain. We will explain clearly what we find and build a progressive, evidence-based rehabilitation plan, including sport-specific return criteria where relevant.
Frequently Asked Questions
Do I need a scan? Not always for milder strains, but imaging can be useful to confirm the grade of injury, particularly if a more significant tear is suspected.
How long will it take to recover? This depends on the grade, mild strains often resolve within 1 to 3 weeks, moderate strains take 4 to 8 weeks, while more severe tears take longer and occasionally require surgical input.
Why does this keep happening to me? Recurrence is genuinely common, occurring in 30 to 40% of cases, usually linked to underlying hip strength deficits not being addressed, or returning to sport based on pain alone rather than proper functional testing.
Can I keep training while this heals? This depends on the grade and your specific activity, your practitioner will guide what's appropriate, but generally some modification of aggravating activities is needed in the earlier stages.
Recognise these symptoms? Get in touch using the contact form and we will assess and build the right treatment plan for you.
References
Hip Flexor Strain Recovery: Why Athletes Keep Re-Injuring It. Helix Sports Medicine. Available at: https://helixsportsmed.com/hip-flexor-strain-recovery-athletes/
Bizzini M, Maffiuletti NA, Leunig M. The athletic hip. Joint status and muscle strength among the key elements in the return to sport process. Frontiers in Sports and Active Living. 2025. Available at: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12647044/
Rehabilitation and return to sport after hamstring strain injury. PMC. Available at: https://pmc.ncbi.nlm.nih.gov/articles/PMC6189266/
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