What Muscles Cause Groin Pain? Complete Anatomy Guide

Groin pain is one of the most complex regional pain syndromes to diagnose. Multiple muscles, tendons, and other structures converge in this area, making it challenging to identify the source. But understanding the muscular anatomy is the first step to solving groin pain.

This guide maps the muscles that cause groin pain and their specific patterns.

The Groin Anatomy

The groin is where your abdomen meets your thigh—a junction point for multiple muscle groups:

• Adductors (pull leg inward)
• Hip flexors (lift leg up)
• Abdominals (attach to pelvis)
• Hip rotators (rotate the thigh)

These muscles share attachments on the pubic bone and create overlapping pain patterns, which is why groin pain is so confusing.

Muscles That Cause Groin Pain

The Adductor Group (Inner Thigh)

1. Adductor Longus — The Primary Groin Muscle

Impact: MAXIMUM

Adductor longus runs from the pubic bone to mid-femur. It's the most commonly injured groin muscle.

Why it causes groin pain:

• Most superficial adductor (vulnerable to strain)
• Active in nearly all leg movements
• Common site of muscle strains and tendinopathy
• Direct groin pain with squeezing legs together

The strain pattern: Adductor longus strains are classic "groin pulls"—sudden pain with kicking, sprinting, or direction changes. Pain is usually at the pubic attachment or upper muscle.

The chronic pattern: Adductor longus tendinopathy causes persistent groin pain that worsens with activity. Common in soccer, hockey, and running sports.

2. Adductor Magnus — The Powerful Adductor

Impact: HIGH

The largest adductor, running from the pubic bone and ischium to most of the femur. It has both adductor and hamstring functions.

Why it causes groin pain:

• Large muscle, significant force generation
• Posterior fibers act like a hamstring
• Strains cause deep groin and inner thigh pain
• Trigger points refer to groin and inner thigh

The dual role: Adductor magnus posterior fibers are functionally a hamstring—they extend the hip. This muscle is often overlooked when it's actually causing what seems like hamstring or groin pain.

3. Adductor Brevis — The Deep Adductor

Impact: MODERATE-HIGH

Sits deep to adductor longus, running from the pubic bone to the upper femur.

Why it causes groin pain:

• Deep groin pain when involved
• Often injured alongside longus
• Trigger points refer to groin and inner thigh

4. Pectineus — The Upper Adductor

Impact: MODERATE-HIGH

Small muscle at the very top of the inner thigh, running from pubic bone to upper femur. It both adducts and flexes the hip.

Why it causes groin pain:

• Very proximal location (right at groin crease)
• Strains create localized groin pain
• Often involved with hip flexor issues
• Can mimic hip joint problems

5. Gracilis — The Long Adductor

Impact: MODERATE

The only adductor crossing both hip and knee, running from pubic bone to inner tibia.

Why it causes groin pain:

• Strains cause groin and inner thigh pain
• Tendinopathy at pubic attachment
• Part of overall adductor complex

The Hip Flexor Group

6. Iliopsoas — The Deep Hip Flexor

Impact: VERY HIGH

The iliopsoas (psoas + iliacus) is the most powerful hip flexor, running from lumbar spine and inner pelvis to the femur.

Why it causes groin pain:

• Runs directly through the groin region
• Trigger points refer to groin, hip, and low back
• Tightness creates anterior hip pain
• Can cause snapping hip syndrome

The referral pattern: Iliopsoas trigger points create a deep ache in the groin and front of hip. This is often mistaken for hip joint problems or adductor issues.

Snapping hip: Iliopsoas tendon can snap over bony prominences, causing audible clicking and sometimes pain in the groin region.

7. Rectus Femoris — The Kicking Muscle

Impact: HIGH

This quad muscle crosses both hip and knee, making it vulnerable to strain during kicking activities.

Why it causes groin pain:

• Proximal attachment at anterior inferior iliac spine (AIIS)
• Strains at hip attachment cause upper thigh/groin pain
• Active in all kicking motions
• Common injury in soccer

The AIIS avulsion: In young athletes, rectus femoris can pull off a piece of bone where it attaches. This causes sudden, severe groin/hip pain.

8. Sartorius — The Tailor's Muscle

Impact: MODERATE

The longest muscle in the body, running from the front of the pelvis (ASIS) across the thigh to the inner knee.

Why it causes groin pain:

• Proximal attachment at anterior pelvis
• Can strain at origin
• Trigger points refer to inner thigh and groin area
• Part of overall hip flexor complex

Abdominal Connection

9. Rectus Abdominis and Obliques

Impact: HIGH (in sports hernia/athletic pubalgia)

The lower abdominals attach to the pubic bone, sharing attachment with the adductors.

Why they cause groin pain:

• Share pubic attachment with adductors
• Sports hernia (athletic pubalgia) involves this junction
• Lower abdominal weakness affects pelvic stability
• Creates groin pain with sit-ups, coughing

Sports hernia/athletic pubalgia: This condition involves the junction where abdominals and adductors meet at the pubic bone. It's not a true hernia but a weakening or tearing of this musculotendinous area.

Other Contributors

10. Obturator Externus and Internus

Impact: MODERATE

Deep hip rotators that can refer pain to the groin.

Why they cause groin pain:

• Deep location near hip joint
• Trigger points refer to groin and hip
• Can create deep, vague groin ache
• Often overlooked

Common Groin Pain Patterns

Pattern 1: Adductor Strain (Acute)

Muscles: Adductor longus (most common), brevis, magnus Cause: Sudden force—kicking, sprinting, direction change Symptoms: Sudden pain, difficulty with leg movements, tenderness Location: Upper inner thigh, pubic attachment Recovery: 4-12 weeks depending on severity

Pattern 2: Adductor Tendinopathy (Chronic)

Muscles: Adductor longus tendon at pubic attachment Cause: Overuse, repetitive strain, inadequate recovery Symptoms: Gradual onset, worse with activity, morning stiffness Location: Pubic bone attachment Recovery: 3-6 months with proper loading

Pattern 3: Hip Flexor/Iliopsoas Pain

Muscles: Iliopsoas, rectus femoris Cause: Tightness, overuse, weakness Symptoms: Deep anterior hip/groin ache, worse with hip flexion Location: Deep groin, front of hip Treatment: Stretching, strengthening, trigger point release

Pattern 4: Sports Hernia (Athletic Pubalgia)

Structures: Abdominal-adductor junction at pubic bone Cause: Repetitive twisting, cutting, kicking forces Symptoms: Groin pain with exertion, coughing, sit-ups Location: Lower abdomen and groin Treatment: Rehabilitation first; surgery if conservative fails

Pattern 5: Hip-Related Groin Pain

Structures: Labrum, hip joint, capsule Cause: FAI, labral tear, arthritis Symptoms: Deep groin pain, clicking, catching, limited ROM Location: Deep in groin, may radiate to buttock Treatment: Depends on specific pathology

The Pubic Bone: Central Crossroads

The pubic symphysis and pubic bones are where multiple structures converge:

• Adductor longus, brevis, magnus attachments
• Gracilis attachment
• Pectineus attachment
• Rectus abdominis attachment
• External oblique aponeurosis

Osteitis pubis: Inflammation of the pubic symphysis, often associated with adductor and abdominal overload. Creates central groin pain that can radiate bilaterally.

Diagnosis Challenges

Why groin pain is hard to diagnose:

1. Multiple structures in small area
2. Overlapping referral patterns
3. Often multiple structures involved
4. Pain can be vague and deep
5. Different structures respond to same provocative tests

The multi-structure problem: Studies show that athletes with groin pain often have pathology in multiple structures—hip joint + adductors, or adductors + abdominals. Single-structure diagnosis may miss the full picture.

The Treatment Framework

For Adductor Strains (Acute)

Phase 1 (Days 1-7): Protection

• Relative rest (avoid painful movements)
• Ice for pain and swelling
• Gentle pain-free ROM
• Compression may help

Phase 2 (Weeks 1-3): Loading Introduction

• Isometric adductor contractions (pain-free)
• Progress to isotonic exercises
• Gradual increase in ROM

Phase 3 (Weeks 3-6+): Strengthening

• Progressive adductor strengthening
• Single-leg exercises
• Sport-specific progressions
• Return to sport criteria

For Adductor Tendinopathy (Chronic)

Loading is medicine:

• Isometrics first (5x45 seconds, moderate load)
• Progress to isotonic (concentric/eccentric)
• Heavy, slow resistance training
• May take 3-6 months

The Copenhagen adductor exercise: Best evidence-supported exercise for groin pain prevention and treatment. Side-lying, partner supports lower leg, lift and lower body using adductors.

For Hip Flexor Pain

Stretching:

• Half-kneeling hip flexor stretch
• Couch stretch for rectus femoris
• Hold 30-60 seconds, multiple times daily

Strengthening:

• Hip flexor strengthening (when appropriate)
• Core stability work
• Single-leg exercises

Trigger point release:

• Iliopsoas release (challenging—deep muscle)
• Rectus femoris release
• May need professional help

For Sports Hernia/Athletic Pubalgia

Conservative first:

• Adductor and core strengthening
• Address muscle imbalances
• Gradual return to activity
• 3-6 month trial

Surgery if conservative fails:

• Various surgical techniques
• Repair of weakened tissues
• Good outcomes in appropriate candidates

Prevention Strategies

Adductor strengthening:

• Copenhagen adductor exercises
• Sumo squats and deadlifts
• Regular maintenance program

Hip flexor flexibility:

• Daily stretching if tight
• Maintain hip extension ROM

Core stability:

• Anti-rotation exercises
• Maintain abdominal strength
• Address any asymmetries

Load management:

• Gradual increases in training
• Adequate recovery
• Monitor for warning signs

The Bottom Line

Groin pain usually involves these muscles:

Primary causes:

1. Adductor longus — most common groin muscle strain
2. Iliopsoas — deep groin pain, hip flexor involvement
3. Adductor magnus — larger muscle, deeper pain
4. Rectus femoris — kicking injuries

Complex causes: 5. Sports hernia — abdominal-adductor junction 6. Hip joint — may need imaging/specialist

The approach:

1. Identify which structure(s) are involved
2. Acute strains need protection then loading
3. Chronic issues need progressive loading
4. Core and hip strengthening for prevention
5. Consider multiple structures may be involved

Groin pain is complex but often responds to proper muscle treatment. The adductors are usually central to the problem—strengthen them, and most groin pain improves.

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