Pain involving the psoas muscle can arise from two fundamentally different situations: a gradual onset of pain from overuse, tightness, or functional problems (commonly called psoas pain or psoas syndrome), and an acute injury to the muscle or tendon from a sudden high-force event (commonly called a psoas pull or psoas strain). These two situations produce different symptoms, require different management, and have different recovery timelines.
Understanding which applies to your situation is the essential first step in managing it correctly. This guide covers the specific causes, symptoms, and distinguishing features of both psoas pain and psoas strain, how to differentiate them from neighbouring conditions that produce similar symptoms, and the treatment approach for each.
Important note: The psoas and groin region contains numerous structures whose conditions can mimic each other: the iliopsoas tendon, the iliopsoas bursa, the hip joint, the inguinal region, and the lumbar nerve roots all produce pain in this general area. This guide helps identify the most likely psoas-related cause, but persistent, severe, or unclear symptoms should be assessed by a doctor or physiotherapist who can examine the area directly.
The Psoas Muscle: Anatomy Relevant to Pain
As covered in the exercise for psoas muscle strengthening and psoas muscles stretch articles on this site, the psoas major originates from the bodies and transverse processes of the lumbar vertebrae (T12 to L5) and inserts on the lesser trochanter of the femur via the iliopsoas tendon. Its course takes it through the pelvis, passing over the pubic ramus and through the femoral triangle before reaching its insertion.
Why psoas anatomy produces distinctive pain patterns:
The psoas muscle’s course through the body creates several specific locations where pain can arise:
Lumbar attachment: Pain at the lumbar vertebral attachments produces deep lower back pain that is often described as deep, difficult to locate precisely, and different in character from the more superficial muscular lower back pain of the erector spinae.
Pelvic course: As the psoas passes through the pelvis, pain along this course produces deep pelvic or lower abdominal pain that can be confused with internal organ pain, particularly in women.
Femoral triangle (anterior hip and groin): Pain at the hip crease and anterior thigh is the most common psoas pain location and can be confused with hip flexor tendon pain, inguinal hernia, hip joint pathology, and femoral nerve irritation.
Iliopsoas tendon: The iliopsoas tendon (where the psoas and iliacus join and insert on the lesser trochanter) can develop tendinopathy or produce a snapping syndrome, producing pain and sometimes an audible or palpable snap at the anterior hip.
Part 1: Psoas Muscle Pain (Chronic, Non-Traumatic)
What It Is
Psoas muscle pain refers to the dull, persistent, or recurrent pain in the anterior hip, groin, or lower back produced by psoas overuse, tightness, weakness, or referred pain from myofascial trigger points within the muscle.
Causes
Prolonged sitting: The most common cause in sedentary populations. When the hip remains at 90 degrees of flexion for many hours daily, the psoas adaptively shortens and develops the chronic tension that produces anterior hip and lower back pain upon standing and activity.
Overuse in athletes: Repeated hip flexion during running, cycling, and kicking activities can overload the psoas beyond its recovery capacity, producing the inflammatory and structural changes of overuse injury within the muscle belly or tendon.
Iliopsoas tendinopathy: Repetitive loading of the iliopsoas tendon produces the structural changes of tendinopathy (as described in the gluteus medius tendon article on this site in the context of a different tendon). The discomfort of iliopsoas tendinopathy is felt in the anterior hip and groin with activity, worsens progressively during loading, and may be accompanied by a snapping sensation.
Iliopsoas snapping syndrome (coxa saltans interna): A condition where the iliopsoas tendon snaps over the iliopectineal eminence (a bony prominence on the pelvic brim) during hip flexion and extension movements. The snap may be painless or painful and is often accompanied by a visible or audible click.
Psoas trigger points: As covered in the gluteus medius trigger points article on this site in the context of the gluteal muscles, trigger points (hyperirritable spots within the muscle) can develop within the psoas and refer pain to the lumbar spine, anterior hip, and thigh.
Lumbar spine pathology: Because the psoas attaches to the lumbar vertebrae, any pathology affecting these vertebrae (disc herniation, facet joint irritation) can produce pain that is referred into the psoas distribution and mimics primary psoas pain.
Symptoms of Psoas Muscle Pain
Pain location:
- Deep anterior hip and groin pain, typically in the hip crease and the area immediately below it
- Deep lower back pain, particularly on one side, that may extend into the lower abdomen or groin
- Pain that is difficult to localise precisely and feels deeper than typical muscular pain
Pain character:
- A dull, persistent aching quality rather than sharp or shooting
- Stiffness in the anterior hip that is worst after periods of rest (particularly after prolonged sitting or in the morning)
- Pain that eases with movement initially but may return or worsen with sustained activity
Aggravating activities:
- Rising from a chair or from the floor after prolonged sitting
- Stair climbing, particularly going upstairs
- Running, particularly at higher speeds or on inclines
- Lying flat on the back (which requires the psoas to relax from its shortened sitting position)
- Prolonged standing
Relieving positions:
- Lying on the side with the hip bent (the psoas is in a shortened, relaxed position)
- Sitting with the hip flexed (paradoxically, this may temporarily relieve psoas pain by reducing the tension on the muscle, though it ultimately perpetuates the tightness)
Associated features:
- Hip flexor tightness on the affected side
- Reduced hip extension range (the tight psoas limits how far the hip can extend behind the body)
- Lower back stiffness or pain, particularly in the morning
- Possible snapping sensation in the anterior hip during hip flexion and extension movements
Part 2: Psoas Pull (Acute Strain)
What It Is
A psoas strain (commonly called a psoas pull) is an acute tear of the psoas muscle fibres or the iliopsoas tendon produced by a sudden, high-force eccentric overload or overstretching of the muscle. It produces sharp, immediate pain in the anterior hip or groin and is an injury rather than a gradual-onset condition.
Causes
Sudden forced hip extension: The most common mechanism for a psoas strain. A sudden forced extension of the hip when the psoas is contracting (such as a goalkeeper’s kick being blocked, a sprinter’s stride reaching maximum extension, or a dancer’s leg being pulled into extension unexpectedly) creates an eccentric overload that can tear the psoas fibres.
Explosive hip flexion: A sudden, maximum-effort hip flexion (kicking a ball with maximum force, a sprint start from blocks, a jumping kick) can produce a strain at the proximal muscle-tendon junction if the force exceeds the tissue’s capacity.
Direct trauma: A direct blow to the anterior hip can contuse the psoas, producing a haematoma (bruising) within the muscle belly.
Hip hyperextension during activity: Gymnastics, martial arts, and dance activities that require extreme hip extension can produce acute psoas strains when the extension forces exceed the muscle’s tensile strength.
Grading of Psoas Strains
As with hamstring strains described in the back of thigh pain article on this site, psoas strains are graded by severity:
Grade 1 (mild): A small number of muscle fibres are torn without significant structural disruption. Pain is mild to moderate and function is largely preserved.
Grade 2 (moderate): A more significant proportion of fibres are torn. Pain is more pronounced and hip flexion strength is noticeably reduced.
Grade 3 (severe): Complete or near-complete rupture of the muscle or tendon. Significant functional impairment. Rare but associated with severe pain and substantial loss of hip flexion strength. May require surgical assessment.
Symptoms of a Psoas Strain
Pain onset:
- Sudden sharp pain in the anterior hip, groin, or the region just below the inguinal ligament at the moment of the injury
- A tearing, pulling, or popping sensation may be felt at the time of injury
Pain location:
- Anterior hip and groin region
- May extend into the inner thigh or down the front of the thigh
- In higher-grade strains, the pain distribution may be broader and less well-defined
Pain character:
- Initially sharp and severe (at the moment of injury)
- Settling to a persistent aching pain within hours
- Sharp pain reproduced by any attempted hip flexion
Functional limitations:
- Difficulty walking, particularly if the hip is in extension during the stride
- Inability to lift the knee without significant pain
- Antalgic gait: walking with the affected hip held in flexion to reduce psoas tension
- Significant pain on stair climbing
- Pain when sitting up from lying (requires active hip flexion)
Physical findings:
- Tenderness on palpation of the iliopsoas along the anterior hip crease
- Pain and weakness with resisted hip flexion testing
- Pain at the end range of hip extension (which stretches the injured tissue)
- Possible bruising in the thigh (in grade 2 to 3 strains) if haematoma develops
Distinguishing Psoas Pain and Strain From Similar Conditions
Several conditions produce anterior hip and groin pain that can be confused with psoas conditions:
Iliopsoas bursitis:
The iliopsoas bursa sits directly adjacent to the iliopsoas tendon. Bursitis produces pain in the same anterior hip and groin location as psoas tendinopathy. Distinguishing features: bursitis often produces more localised swelling and tenderness directly over the bursa, and is often associated with a specific episode of overuse or a change in activity. In practice, iliopsoas tendinopathy and bursitis frequently coexist and may not be clinically distinguishable without imaging.
Hip impingement (FAI):
As mentioned in the medial hip rotation article on this site, hip impingement produces anterior hip and groin pain that is consistently reproduced by the FADIR position (hip flexion, adduction, and internal rotation). Psoas pain is not specifically reproduced by this combination of movements. Hip impingement pain may be more consistently associated with activities involving deep hip flexion combined with rotation.
Inguinal hernia:
An inguinal hernia produces a bulge and aching pain in the groin region. Distinguishing features: the hernia produces a visible or palpable bulge, the pain is typically in the inguinal canal region (slightly above the hip crease) rather than in the anterior hip, and the pain may worsen with coughing, sneezing, or bearing down. Any groin pain accompanied by a visible bulge should be assessed medically promptly.
Femoral nerve irritation:
The femoral nerve passes adjacent to the psoas and can be irritated by psoas tightness or a psoas haematoma. Distinguishing features: femoral nerve irritation produces pain and altered sensation extending down the front of the thigh, possibly to the knee or lower leg, which psoas muscle pain typically does not. Weakness in knee extension (quadriceps weakness) may be present.
Hip flexor tendinopathy (rectus femoris):
The rectus femoris tendon attaches at the anterior inferior iliac spine (AIIS), slightly above and lateral to the psoas attachment. Rectus femoris tendinopathy produces pain specifically at the AIIS. Distinguishing from psoas: the location of maximum tenderness (higher and more lateral for rectus femoris, lower and more medial for psoas) helps distinguish the two.
Adductor strain:
As described in the back of thigh pain article on this site in the context of adductor anatomy, adductor strains produce inner thigh and groin pain that can overlap with psoas pain. Distinguishing features: adductor strains are most tender along the inner thigh and at the adductor origin on the pubic bone, and are specifically reproduced by resisted hip adduction rather than hip flexion.
Treatment for Psoas Muscle Pain (Chronic)
Address the underlying cause:
The most important intervention. If prolonged sitting is the primary cause, reduce sitting duration and introduce regular movement breaks. If overuse in sport is the cause, reduce training volume and identify the specific mechanical factors (running mechanics, cycling position, kick technique) that are overloading the psoas.
Psoas stretching:
As covered in the psoas muscles stretch article on this site, the kneeling hip flexor stretch with posterior pelvic tilt is the most effective psoas stretch. Perform 90 seconds per side, twice daily for meaningful flexibility development.
Psoas strengthening:
As covered in the exercise for psoas muscle strengthening article on this site, progressive psoas strengthening is often more effective than stretching alone for chronic psoas pain because it addresses the weakness-driven protective tension that is frequently the underlying cause.
Trigger point release:
If psoas trigger points are contributing, sustained pressure release and foam rolling of the hip flexors can provide relief, though direct psoas trigger point release requires clinical expertise because of the muscle’s deep location.
Heat:
Heat applied to the anterior hip and lower abdomen promotes circulation and reduces muscular tension. Appropriate for the muscular tightness component of psoas pain.
Treatment for a Psoas Strain (Acute)
Immediate management (days 1 to 3):
- Rest from aggravating activities
- Ice application to the anterior hip for 15 to 20 minutes every 2 hours during the first 24 to 48 hours to reduce swelling and pain
- Compression around the upper thigh if swelling is present
- Avoid full hip extension positions that stretch the injured tissue (lying flat may be uncomfortable; lying with the hip slightly bent is more comfortable)
Early rehabilitation (days 3 to 14 for grade 1, days 5 to 21 for grade 2):
- Gentle, pain-free range of motion: slow hip circles in a supported position
- Progress to gentle active hip flexion within pain tolerance
- Begin isometric hip flexion exercises once acute pain reduces
- Heat from day 3 to 5 onward to promote circulation to the healing tissue
Progressive loading (week 2 onward for grade 1, week 3 onward for grade 2):
- Begin the level 1 psoas strengthening exercises from the exercise for psoas muscle strengthening article on this site
- Progress through the levels as pain allows
- Return to sport activities begins when full hip flexion strength is restored and running is pain-free
Grade 3 strains:
Complete or near-complete psoas ruptures require medical assessment to determine whether surgical repair is indicated. Conservative management with an extended rehabilitation period is appropriate for most cases, with surgical repair reserved for significant functional deficits.
When to Seek Medical Assessment
Seek assessment from a doctor or physiotherapist if:
- Pain is severe and significantly limiting walking or basic function
- Symptoms are not improving after 2 to 3 weeks of appropriate home management
- Significant hip flexion weakness is present
- Pain is accompanied by a visible lump or bulge in the groin
- Pain extends significantly down the front of the thigh or is associated with thigh numbness, tingling, or weakness
- There is visible bruising extending into the thigh after an acute injury
- Fever, general malaise, or other systemic symptoms accompany the hip pain (which may indicate an infection or iliopsoas abscess, a rare but serious condition)
Frequently Asked Questions
How long does a psoas strain take to heal?
Grade 1 psoas strains typically resolve within 1 to 3 weeks with appropriate management. Grade 2 strains typically require 4 to 8 weeks before return to full activity. Grade 3 strains may require 3 to 6 months of rehabilitation with or without surgical intervention. Chronic psoas pain without an acute strain typically improves within 4 to 8 weeks of addressing the underlying cause (tightness, weakness, or overuse), though the timeline varies significantly with the chronicity and severity of the problem.
Can a psoas strain be confused with a hip flexor strain?
Yes, frequently. The iliopsoas group (psoas major and iliacus) is often collectively referred to as the hip flexors, and a psoas strain is technically a hip flexor strain. The distinction that matters clinically is between a psoas/iliopsoas strain (pain in the anterior hip and groin region) and a rectus femoris strain (pain at the AIIS or in the front of the thigh), as the two have slightly different mechanisms, locations, and management approaches.
Is it safe to stretch the psoas after a strain?
Not immediately. In the acute phase (first 48 to 72 hours), stretching the injured tissue can worsen the tear and should be avoided. Once the acute inflammatory phase has settled (typically after 3 to 5 days for grade 1 strains), gentle stretching within comfort limits can begin. The stretch should produce a gentle pull rather than pain. If stretching consistently produces sharp pain, the tissue is not ready and stretching should be postponed.
Can psoas problems cause lower back pain?
Yes, directly and significantly. Because the psoas attaches to the lumbar vertebrae, psoas tightness creates a forward pull on the lumbar spine that increases the lumbar curve and loads the posterior spinal structures. Psoas weakness leaves the lumbar spine without its primary anterior dynamic stabiliser during hip loading, producing compensatory lumbar extensor overactivity. Both mechanisms produce lower back pain that frequently improves significantly when the psoas is both stretched and strengthened.
What is an iliopsoas abscess and should I be worried?
An iliopsoas abscess is a rare but serious collection of pus within the iliopsoas muscle compartment, typically caused by bacterial infection spreading from an adjacent structure (a lumbar disc, the bowel, or the kidney). Symptoms include deep hip and lower back pain, fever, general illness, and difficulty walking. This condition requires urgent medical assessment and is not managed with the exercise approaches described in this guide. If hip pain is accompanied by fever or significant general illness, seek medical assessment promptly.