Hip and Groin Pain: Causes and Differential Diagnosis

To learn more, consult the guide on Hip Pain: Complete Guide to Causes and Rehabilitation. To learn more, consult the guide on Exercises for Hip Pain: Strengthening and Mobility. To learn more, consult the guide on Groin Pain: Muscular, Articular, and Visceral Causes.

Hip and groin pain represents an extremely common and often complex musculoskeletal problem that can affect individuals of all ages, from athletes to the elderly. Its incidence is high, and the underlying causes can be numerous, making differential diagnosis a significant challenge even for the most experienced clinicians. This anatomical region is a crossroads of bone, joint, muscle, tendon, ligament, and nerve structures, as well as being a site for potential referred pain from internal organs. Understanding the functional anatomy, various etiologies, and systematic diagnostic approach is fundamental for effective and targeted treatment. This article aims to deeply explore the most common causes of hip and groin pain, associated symptoms, principles of differential diagnosis, and physiotherapy management strategies, based on consolidated clinical experience and current scientific evidence.

Functional Anatomy of the Hip and Groin

Functional anatomy of the hip and groin examines the structural relationships and movement patterns of muscles, joints, and nerves in the hip-pelvis region to understand how dysfunction causes localized or referred pain. To appreciate the complexity of pain in this region, it is essential to recall the main anatomical structures involved.

Joints and Bones

The hip joint is one of the largest and most stable joints in the body, a spheroidal diarthrosis that allows for a wide range of motion. It is formed by the head of the femur and the acetabulum of the iliac bone. Stability is ensured by a robust joint capsule and powerful ligaments (iliofemoral, pubofemoral, ischiofemoral). The pubic symphysis, a cartilaginous joint that unites the two halves of the pelvis anteriorly, and the sacroiliac joints, posteriorly, are also important sources of pain referred to the groin or hip.

Muscles and Tendons

Numerous muscles cross or insert around the hip and groin, playing crucial roles in movement and stability.

• Hip flexor muscles: Iliopsoas (iliacus and psoas), rectus femoris.
• Hip extensor muscles: Gluteus maximus, hamstrings (biceps femoris, semitendinosus, semimembranosus).
• Hip abductor muscles: Gluteus medius and minimus, tensor fasciae latae.
• Hip adductor muscles: Adductor longus, brevis, magnus, gracilis, pectineus.
• External rotator muscles: Piriformis, gemelli, obturators, quadratus femoris.
• Abdominal muscles: Rectus abdominis, internal and external obliques, transversus abdominis, which insert into the pubic region and can contribute to groin pain.

Tendinopathies of these muscles are frequent causes of pain.

Ligaments and Bursae

In addition to the capsular ligaments, the acetabular labrum, a fibrocartilaginous structure surrounding the rim of the acetabulum, increases the depth of the socket and contributes to stability and proprioception. Several serous bursae (e.g., trochanteric bursa, iliopsoas bursa, ischial bursa) reduce friction between tendons, muscles, and bones, but can become inflamed.

Nerves and Vessels

Important nerves such as the femoral nerve, obturator nerve, sciatic nerve, and lateral femoral cutaneous nerve (meralgia paresthetica) innervate the region and can be a source of neuropathic pain. Major blood vessels like the femoral artery and vein pass through the groin.

Classification of Hip and Groin Pain

Hip and groin pain can be classified based on various parameters:

• Location: Anterior (groin, pubic region), lateral (greater trochanter), posterior (buttock, sacroiliac), medial (inner thigh).
• Onset: Acute (traumatic or sudden) or chronic (persisting for more than 3-6 months).
• Nature: Nociceptive (muscular, articular, bone, tendinous), neuropathic (from nerve compression), or referred (from internal organs).
• Etiology: Musculoskeletal (most common), visceral, vascular, neurological, rheumatological, oncological.

Common Causes of Hip and Groin Pain

The causes of hip and groin pain are extremely varied. An accurate diagnosis requires careful evaluation to distinguish between different conditions.

1. Musculoskeletal Causes

A. Hip Joint Pathologies

• Hip Osteoarthritis (Coxarthrosis): Progressive degeneration of articular cartilage. It is one of the most common causes of chronic hip pain, especially in the elderly.

Symptoms:* Deep groin pain, which may radiate to the anterior thigh or knee. Morning stiffness, pain that worsens with activity and improves with rest in the initial stages, but can become constant in advanced stages. Reduced range of motion (ROM), particularly internal rotation and abduction.

• Femoroacetabular Impingement (FAI): A condition where abnormal contact between the femur and the acetabulum causes mechanical conflict during movement, leading to damage to the acetabular labrum and cartilage. There are three types: CAM (deformity of the femoral head/neck), Pincer (excessive acetabular coverage), or Mixed.

Symptoms:* Deep groin pain, often aggravated by hip flexion, adduction, and internal rotation (positive FADIR test). There may be a “click” or locking. Often affects active young adults.

• Acetabular Labral Tears: Often associated with FAI or trauma, but can occur in isolation.

Symptoms:* Groin pain, “clicking”, locking, sensation of instability.

• Hip Dysplasia: Abnormal development of the joint, with a shallow acetabulum or poorly contained femoral head, which can lead to instability and early osteoarthritis.
• Avascular Necrosis of the Femoral Head (AVN): Death of bone tissue due to interruption of blood supply.

Symptoms:* Deep, constant pain, worsening with weight-bearing. Can lead to femoral head collapse and arthritis. Risk factors include corticosteroid use, alcoholism, trauma.

• Femoral Neck Stress Fractures: Microfractures of the bone due to repetitive stress, common in athletes or individuals with osteopenia/osteoporosis.

Symptoms:* Deep pain, worsening with weight-bearing and physical activity, relieved by rest.

B. Tendinous and Muscular Pathologies

• Adductor Tendinopathy (Pubalgia or Groin Pain Syndrome): An umbrella term describing pain in the groin region, often related to overuse or imbalance of the adductor muscles. It can involve the insertion of the adductor tendons into the pubic bone, the pubic symphysis itself (osteitis pubis), or the abdominal muscles.

Symptoms:* Groin or inner thigh pain, aggravated by activities involving the adductors (kicking, running, changes of direction). Pain on palpation of the pubic insertion.

• Iliopsoas Tendinopathy: Inflammation or degeneration of the iliopsoas muscle tendon.

Symptoms:* Anterior groin pain, aggravated by hip flexion against resistance or forced hip extension.

• Gluteal Tendinopathy (Gluteus Medius and Minimus): Often associated with lateral hip pain, sometimes mistakenly diagnosed as trochanteric bursitis.

Symptoms:* Pain on the outer side of the hip, which may radiate to the lateral thigh. Aggravated by walking, climbing stairs, standing on one leg, sleeping on the affected side.

• Muscle Strains: Acute injuries to muscle fibers, common in athletes (e.g., adductor strain, hamstring strain, rectus femoris strain).

Symptoms:* Acute, sudden pain, often accompanied by a “pop” or “tear”, swelling, bruising, weakness.

C. Bursitis

• Trochanteric Bursitis: Inflammation of the bursa located over the greater trochanter of the femur.

Symptoms:* Pain on the outer side of the hip, worsening with direct pressure (sleeping on the side), walking, climbing stairs.

• Iliopsoas Bursitis: Inflammation of the bursa between the iliopsoas tendon and the hip joint capsule.

Symptoms:* Anterior groin pain, similar to iliopsoas tendinopathy.

D. Nerve Pathologies

• Meralgia Paresthetica: Compression of the lateral femoral cutaneous nerve, causing numbness, burning, or pain on the outer part of the thigh. It is not strictly hip pain, but can be confused with it.
• Lumbar Radiculopathy: Compression of a nerve root in the lumbar spine (e.g., L1-L3) which can refer pain to the groin or anterior thigh.
• Obturator Nerve Neuropathy: Compression or irritation of the obturator nerve, which can cause pain in the groin and inner thigh.

E. Bone and Pubic Symphysis Pathologies

• Osteitis Pubis: Inflammation of the pubic symphysis and surrounding structures, often due to repetitive stress or muscle imbalances.

Symptoms:* Pain localized to the pubis, worsening with physical activity, coughing, sneezing.

• Sacroiliitis: Inflammation of the sacroiliac joint.

Symptoms:* Pain in the gluteal region, which may radiate to the groin, posterior thigh, or flank. Often associated with spondyloarthropathies.

2. Non-Musculoskeletal Causes (Referred Pain)

Hip and groin pain can be a symptom of pathologies that do not originate directly from the musculoskeletal structures of the region.

• Hernias: Inguinal or femoral hernia, where a portion of the intestine or adipose tissue protrudes through a weak point in the abdominal wall.

Symptoms:* Swelling or bulge in the groin, pain that worsens with straining, coughing, lifting weights.

• Urological Pathologies: Kidney stones, urinary tract infections, prostatitis.
• Gynecological Pathologies: Endometriosis, ovarian cysts, pelvic inflammatory disease.
• Gastrointestinal Pathologies: Appendicitis, diverticulitis, irritable bowel syndrome.
• Vascular Pathologies: Abdominal aortic aneurysm (rare but serious), peripheral arterial insufficiency.
• Tumors: Primary or metastatic bone tumors, soft tissue tumors.
• Infections: Septic arthritis of the hip (medical emergency), osteomyelitis.
• Rheumatic Diseases: Rheumatoid arthritis, spondyloarthropathies (e.g., ankylosing spondylitis).

Anamnesis and Physical Examination: The Diagnostic Key

An accurate diagnosis of hip and groin pain is based on a detailed anamnesis and a thorough physical examination.

Anamnesis

The doctor or physical therapist will gather crucial information:

• Pain location: The patient must precisely indicate where they feel the pain. Anterior groin pain suggests hip joint pathologies, iliopsoas, or adductors; lateral pain suggests gluteal tendinopathy or trochanteric bursitis; posterior pain suggests sacroiliitis or lumbar pathologies.
• Onset: Acute (traumatic, sudden) or gradual.
• Pain characteristics: Type (dull, sharp, burning, shooting), intensity, aggravating factors (movement, weight-bearing, specific activities) and alleviating factors (rest, ice).
• Associated symptoms: “Clicking”, locking, sensation of instability, weakness, numbness, tingling, swelling, fever, weight loss.
• Activities: Level of physical activity, sports practiced, type of work.
• Medical history: Pre-existing conditions, surgeries, medications taken.
• Systemic symptoms: Fever, unexplained weight loss, night sweats, which may indicate more serious conditions.

Physical Examination

The physical examination is systematic and includes:

• Inspection: Assessment of posture, gait, asymmetries, muscle atrophy, swelling, bruising.
• Palpation: Identification of specific painful points (e.g., greater trochanter, pubic symphysis, adductor tendons, iliopsoas).
• Range of Motion (ROM) Assessment: Active and passive ROM of the hip, lumbar spine, and sacroiliac joints. Limited ROM, especially internal rotation and abduction, is common in osteoarthritis.
• Muscle Tests: Assessment of strength and endurance of the main hip and core muscle groups.
• Special Tests: Specific maneuvers to elicit pain and identify the involved structure. Examples include:

• FADIR Test (Flexion, Adduction, Internal Rotation): For FAI and labral tears.

• FABER Test (Flexion, Abduction, External Rotation): For hip, sacroiliac, or iliopsoas pathologies.

• Thomas Test: For iliopsoas tightness.

• Ober Test: For iliotibial band tightness.

• Trendelenburg Test: For gluteus medius weakness.

• Tests for pubalgia: Palpation of the pubic symphysis, resisted adduction.
• Neurological Assessment: Reflexes, sensation, muscle strength to rule out radiculopathies.
• Lumbar Spine and Sacroiliac Examination: Given the potential for referred pain.

Differential Diagnosis: A Systematic Approach

Differential diagnosis requires careful integration of anamnesis, physical examination, and, when necessary, instrumental investigations.

Instrumental Investigations

• X-rays (RX): Useful for evaluating bone and joint. Can show signs of osteoarthritis (joint space narrowing, osteophytes), FAI, dysplasia, fractures.
• Magnetic Resonance Imaging (MRI): Excellent for visualizing soft tissues (tendons, muscles, acetabular labrum, bursae), bone edema (stress fractures, AVN), and tumors. It is often the imaging of choice for labral tears, complex tendinopathies, and AVN.
• Ultrasound: Useful for evaluating tendons (tendinopathies), bursae (bursitis), joint effusions, inguinal hernias, and for guiding injections.
• Computed Tomography (CT): Provides superior bone detail compared to X-rays, useful for complex fractures or for a more detailed assessment of bone morphology in FAI.
• Bone Scintigraphy: Can identify areas of increased bone metabolism, useful for stress fractures, infections, tumors.
• Laboratory Tests: Useful for ruling out inflammatory causes (e.g., ESR, CRP for rheumatic arthritis) or infectious causes (complete blood count, cultures).

The doctor or physical therapist will guide the choice of the most appropriate diagnostic tests based on the clinical picture.

General Physiotherapy Treatment

Physiotherapy treatment for hip and groin pain is highly individualized and depends on the specific diagnosis, symptom severity, and patient goals. General objectives include pain reduction, restoration of function, improvement of strength and flexibility, and prevention of recurrence.

Treatment Phases

1. Acute Phase (Pain and Inflammation Management)

• Relative Rest: Modification of activities that aggravate pain, not necessarily absolute rest.
• Instrumental Physical Therapies: Can be used for pain and inflammation management. Examples include:

• Cryotherapy (ice): To reduce pain and swelling.

• TENS (Transcutaneous Electrical Nerve Stimulation): For pain control.

• Laser therapy, Ultrasound, Tecar therapy: Can promote tissue healing and reduce inflammation, but their effectiveness must be evaluated on a case-by-case basis.
• Manual Therapy: Gentle techniques to reduce muscle tension and improve joint mobility.

2. Subacute and Chronic Phase (Function Recovery)

This phase is the core of physiotherapy treatment and focuses on restoring strength, flexibility, and motor control.

• Manual Therapy:

• Joint Mobilizations: To improve ROM of the hip and adjacent joints (lumbar, sacroiliac).

• Myofascial Techniques and Therapeutic Massage: To reduce muscle tension and adhesions.

• Stretching: To improve flexibility of tight muscles (e.g., iliopsoas, adductors, hamstrings).
• Therapeutic Exercise: Progressive and individualized program.

• Muscle Strengthening:

Gluteal Muscles (Gluteus Medius and Minimus): Essential for pelvic stability and prevention of lateral pain. Exercises such as clam shells, side-lying leg raises, glute bridges*.
Adductor Muscles: Eccentric and concentric strengthening, crucial in managing pubalgia. Exercises such as squeezing a ball between knees, adductor slides*.
Core Muscles: Strengthening of deep abdominal and lumbar muscles to improve trunk and pelvic stability. Exercises such as plank, bird-dog*.

• Hip Flexor and Extensor Muscles: To balance muscle strength.

• Motor Control and Proprioception Exercises: To improve coordination and movement awareness. Examples: exercises on unstable surfaces, single-leg balance.

• Functional Re-education: Restoration of correct movement patterns for daily, work, and sports activities. Includes specific exercises for walking, running, jumping, and changes of direction, if relevant.

• Stretching and Flexibility Exercises: Maintaining optimal muscle length to prevent new tightness.
• Patient Education:

• Load Management: Understanding how to manage load on painful structures to promote healing and prevent overuse.

• Postural Ergonomics: Advice on sitting, standing, and sleeping posture.

• Lifestyle Modifications: Adaptations to activities to reduce stress on the hip and groin.

Examples of Exercises (General, to be customized)

• Glute Bridge: Lie supine, knees bent, feet on the floor. Lift the pelvis by contracting the glutes. Useful for strengthening glutes and core.
• Clam Shells: Lie on your side, knees bent, feet together. Keeping feet together, lift the top knee. For the gluteus medius.
• Adductor Squeeze: Lie supine, knees bent. Squeeze a pillow between your knees. For the adductors.
• Leg Swings (control): Standing, holding onto a support. Swing the leg back and forth or sideways with control. To improve ROM and dynamic mobility.
• Plank: For core strengthening.

It is essential that any exercise program is supervised and customized by your doctor or physical therapist, to avoid aggravating the condition or performing exercises incorrectly.

Prevention

Prevention of hip and groin pain focuses on maintaining general musculoskeletal health and managing risk factors:

• Warm-up and Cool-down: Always perform an adequate warm-up before physical activity and a cool-down with stretching afterwards.
• Gradual Training Progression: Gradually increase training intensity and volume to allow tissues time to adapt.
• Balanced Strength and Flexibility: Maintain a good balance between strength and flexibility of the hip, core, and leg muscles.
• Correct Technique: Learn and apply correct technique in sports and work activities.
• Ergonomics: Adopt ergonomic postures at work and in daily life.
• Appropriate Footwear: Use appropriate footwear for the activity performed, with good support and cushioning.
• Listen to Your Body: Do not ignore pain signals and promptly consult a professional in case of persistent symptoms.

Frequently Asked Questions (FAQ)

Conclusion

Hip and groin pain is a multifactorial condition that requires a meticulous diagnostic and therapeutic approach. The wide range of possible causes, from the most common musculoskeletal problems to rarer ones or those referred from other body systems, underscores the importance of accurate anamnesis, a thorough physical examination, and, when necessary, targeted instrumental investigations. Personalized physiotherapy treatment, based on scientific evidence and clinical experience, is fundamental for alleviating pain, restoring function, and improving patients’ quality of life. In the presence of persistent or unexplained hip or groin pain, it is always advisable to consult your doctor or physical therapist for an appropriate evaluation and treatment plan.

Frequently Asked Questions

How is the specific cause of hip and groin pain typically identified?

Identifying the specific cause involves a comprehensive clinical assessment, including a detailed history and a thorough physical examination. In some cases, diagnostic imaging or other investigations may be utilized to confirm a diagnosis or rule out other conditions.

Can hip and groin pain originate from areas other than the hip joint itself?

Yes, pain in the hip and groin region can frequently be referred from other structures, such as the lumbar spine, sacroiliac joint, or even internal organs. A comprehensive evaluation is crucial to differentiate between local and referred sources of pain.

What is the primary role of a physical therapist in managing hip and groin pain?

A physical therapist conducts a detailed assessment to determine the underlying cause of the pain and develops an individualized treatment plan. This plan often includes therapeutic exercises, manual therapy techniques, and education on pain management and activity modification.

What are some general approaches to help prevent the onset or recurrence of hip and groin pain?

Prevention strategies often involve maintaining good physical conditioning through regular exercise that promotes strength, flexibility, and proper movement patterns. Gradual progression of physical activity and addressing any biomechanical imbalances can also be beneficial.

For a broader overview of related conditions, see our complete guide to hip pain.

Sources and Scientific References

1. Weir A, Brukner P, Delahunt E, et al. Doha agreement meeting on terminology and definitions in groin pain in athletes. Br J Sports Med. 2015;49(12):768-774. DOI: 10.1136/bjsports-2015-094869
2. Griffin DR, Dickenson EJ, O’Donnell J, et al. The Warwick Agreement on femoroacetabular impingement syndrome. Br J Sports Med. 2016;50(19):1169-1176. DOI: 10.1136/bjsports-2016-096743
3. Reiman MP, Goode AP, Cook CE, et al. Diagnostic accuracy of clinical tests for the diagnosis of hip femoroacetabular impingement/labral tear. Br J Sports Med. 2015;49(12):811. DOI: 10.1136/bjsports-2014-094302

Sources and Scientific References

1. Weir A et al. (2015). Doha agreement meeting on terminology and definitions in groin pain in athletes. Br J Sports Med. 49:768-74. DOI | PubMed
2. Harris-Hayes M et al. (2023). Comparison of Joint Mobilization and Movement Pattern Training for Patients With Hip-Related Groin Pain: A Pilot Randomized Clinical Trial. Phys Ther. 103. DOI | PubMed
3. Zuckerbraun BS et al. (2020). Groin Pain Syndrome Known as Sports Hernia: A Review. JAMA Surg. 155:340-348. DOI | PubMed
4. Reiman MP et al. (2020). Consensus recommendations on the classification, definition and diagnostic criteria of hip-related pain in young and middle-aged active adults from the International Hip-related Pain Research Network, Zurich 2018. Br J Sports Med. 54:631-641. DOI | PubMed
5. Bisciotti GN et al. (2024). Groin Pain Syndrome Italian Consensus Conference update 2023. J Sports Med Phys Fitness. 64:402-414. DOI | PubMed