Endometriosis

Populations and Risk Factors

Women of reproductive age, typically diagnosed between ages 25–35; average diagnostic delay is 7–10 years from symptom onset
First-degree relatives have 7–10 times higher risk, suggesting strong genetic/familial component
Early menarche (before age 12), short menstrual cycles (<27 days), heavy or prolonged menstrual flow
Nulliparity (never having been pregnant) and delayed childbearing
Low body mass index is associated with higher prevalence (possibly due to altered estrogen metabolism)
Mullerian duct anomalies that impair menstrual outflow increase retrograde menstruation risk
Asian women have higher prevalence than Caucasian and Black women in some population studies, though diagnostic access confounds these data

Causes and Pathophysiology

Retrograde Menstruation (Sampson's Theory)

The most widely accepted mechanism: menstrual blood flows retrograde through the fallopian tubes into the peritoneal cavity, depositing viable endometrial cells on pelvic structures. Approximately 90% of menstruating women experience some retrograde menstruation, but only 10–15% develop endometriosis — this discrepancy points to immune and genetic cofactors that determine whether the implanted cells survive and proliferate.

Immune Dysfunction and Implant Survival

In endometriosis, peritoneal macrophages and natural killer cells fail to clear ectopic endometrial tissue. Reduced immune surveillance allows implants to establish blood supply (angiogenesis), evade apoptosis, and invade surrounding tissue.
The implants produce their own estrogen via aromatase enzyme activity, creating a self-sustaining hormonal microenvironment independent of ovarian cycling — this explains why some symptoms persist even with hormonal suppression therapy.

Alternative Pathogenic Mechanisms

Coelomic metaplasia: peritoneal mesothelial cells differentiate into endometrial-type tissue under hormonal or inflammatory stimulation — may explain endometriosis in rare male cases and in women without fallopian tubes
Lymphatic/vascular dissemination: endometrial cells spread via lymphatic or blood vessels to distant sites (diaphragm, lungs, brain), explaining extrapelvic endometriosis
Stem cell theory: bone marrow-derived stem cells differentiate into endometrial tissue at ectopic sites

Chronic Inflammation and Adhesion Formation

Ectopic endometrial tissue undergoes cyclic hormonal stimulation with each menstrual cycle — proliferating, bleeding, and then unable to be shed. This creates a repetitive inflammatory cycle with each menses.
Prostaglandins, cytokines, and growth factors released by the implants produce chronic peritoneal inflammation that extends beyond the implant sites.
Chronic inflammation triggers fibroblast activation and collagen deposition, forming dense adhesions that distort pelvic anatomy, bind organs together, and restrict organ mobility — this mechanical distortion contributes to pain independently of the active implants.

Viscerosomatic Reflex and Musculoskeletal Consequences

Chronic pelvic visceral pain produces sustained viscerosomatic reflex activation through the T10–L2 spinal segments (the sympathetic innervation of the uterus, ovaries, and pelvic peritoneum). This reflexively increases paraspinal and abdominal wall muscle tone at these levels.
The psoas major, sharing innervation from L1–L3 and anatomical proximity to the pelvic organs, develops protective hypertonicity — this shortens the hip flexor complex and produces secondary hip flexion contracture, anterior pelvic tilt, and compensatory lumbar hyperlordosis.
Pelvic floor muscles (levator ani, coccygeus) develop chronic guarding in response to sustained deep pelvic pain — this creates a cycle where pelvic floor hypertonicity compresses pelvic nerves (pudendal, obturator) and worsens pain.
Compensatory gait changes emerge: shortened stride length, reduced hip extension, increased lumbar motion during walking, and thoracolumbar junction stiffness from chronic paraspinal guarding.

Why This Matters for Palpation and Treatment

Thoracolumbar junction tension (T10–L2) traces directly to the viscerosomatic reflex — treating this area reduces afferent nociceptive input to the spinal cord.
Psoas hypertonicity is not a primary muscle pathology but a neurally mediated protective response to chronic pelvic visceral pain — it responds to sustained pressure and positional release better than aggressive stretching.
Abdominal wall guarding (rectus abdominis, obliques) is a protective pattern overlying inflamed pelvic structures — deep intrusive abdominal work risks aggravating peritoneal adhesions and underlying inflammation.

Signs and Symptoms

Pelvic and Pain Presentation

Chronic pelvic pain that may be constant or cyclic, characteristically worsening with menstruation (but not limited to menstrual periods)
Dysmenorrhea (painful periods) that is progressive — worsens over months to years rather than remaining stable
Dyspareunia (deep pain during sexual intercourse), particularly with deep penetration
Dyschezia (pain with bowel movements) and dysuria (pain with urination), especially during menstruation
Pain may be disproportionate to the extent of visible disease — minimal implants can produce severe pain; extensive disease can be minimally symptomatic

Systemic and Secondary Symptoms

Heavy menstrual bleeding (menorrhagia) or intermenstrual spotting
Infertility (30–50% of women with endometriosis experience difficulty conceiving) — adhesions block fallopian tubes, distort ovarian anatomy, and create a hostile peritoneal environment for fertilization
Chronic fatigue, bloating, nausea — attributed to chronic systemic inflammation and prostaglandin release
Referred pain to inner thighs, low back, and sacral region
Catamenial pneumothorax: rare but clinically significant recurrent lung collapse during menstruation from diaphragmatic or pleural endometriosis

Musculoskeletal Compensatory Presentation

Lumbopelvic muscle guarding with restricted lumbar ROM (particularly extension and lateral flexion)
Bilateral psoas hypertonicity with positive Thomas test (hip flexor shortening)
Antalgic gait with shortened stride and reduced hip extension
Thoracolumbar junction stiffness and paraspinal guarding (T10–L2)
Pelvic floor hypertonicity with associated hip adductor tension

Assessment Profile

Subjective Presentation

Chief complaint: "I have constant deep pelvic pain that gets much worse during my period — my low back aches all the time and my hips feel tight and stuck"; may report that the pain has progressively worsened over years; often describes a long diagnostic journey with multiple healthcare providers
Pain quality: deep, aching pelvic pain with sharp exacerbations during menstruation; dull constant lumbosacral ache; pulling sensation in the hip flexors; cramping quality in the lower abdomen; intensity often rated 6–9/10 during menstruation, 3–5/10 baseline
Onset: insidious, typically beginning in adolescence or early adulthood; progressive worsening over years; average 7–10 year diagnostic delay; secondary MSK complaints develop gradually as compensatory patterns become established
Aggravating factors: menstruation (primary aggravator), prolonged sitting (compresses psoas and pelvic floor), deep penetration during intercourse, straining during bowel movements, sustained standing, cold weather (increases muscle guarding)
Easing factors: warmth to the lower abdomen and low back (relaxes viscerosomatic reflex-driven muscle guarding), supine with hips and knees flexed (shortens psoas, reduces pelvic floor tension), gentle movement and walking (prevents stiffness), hormonal suppression therapy (GnRH agonists, oral contraceptives)
Red flags: Sudden severe abdominal pain with rigidity — suspect ruptured endometrioma (ovarian cyst); emergency referral; do not treat. New-onset leg weakness or saddle anesthesia with pelvic symptoms — suspect cauda equina involvement; emergency referral. Cyclical chest pain or shortness of breath during menstruation — suspect catamenial pneumothorax; medical referral.

Observation

Local inspection: lower abdominal guarding visible on observation (client splints when transitioning positions); possible abdominal distension ("endo belly"); no specific visible pathology externally — the condition is internal
Posture: anterior pelvic tilt from bilateral psoas shortening; increased lumbar lordosis; mild thoracolumbar kyphosis at the T-L junction from sustained paraspinal guarding; weight shifting and guarding posture during flares
Gait: shortened stride length with reduced hip extension bilaterally; increased lumbar segmental motion compensating for restricted hip extension; mild lateral trunk shift may be present if pain is predominantly unilateral

Palpation

Tone: bilateral psoas hypertonicity (palpable through the abdomen as a firm, tender band along the iliac fossa); lumbar paraspinals guarded T10–L2 (viscerosomatic reflex zone); hip adductors hypertonic bilaterally; gluteal inhibition (reduced tone) secondary to hip flexor dominance; lower abdominal wall protective guarding (rectus abdominis, obliques)
Tenderness: thoracolumbar junction paraspinals (T10–L2) — viscerosomatic reflex tenderness that does not correspond to a local spinal lesion; psoas tenderness on abdominal palpation; sacroiliac region and sacral base tenderness; hip adductor origins (pubic ramus); greater trochanteric region from compensatory gluteal dysfunction
Temperature: normal over the lumbopelvic region in the absence of acute flare; may feel slightly warm over the lower abdomen during menstruation (increased blood flow and inflammatory activity); cool extremities if chronic pain has produced sympathetic vasoconstriction
Tissue quality: psoas and lumbar paraspinals have a chronic, ropy, fibrotic quality from sustained guarding — not acute protective spasm; hip adductors may show taut bands and trigger points; pelvic floor (assessed externally via perineal body tension and ischial tuberosity approximation) may feel chronically taut; thoracolumbar fascia restricted and inelastic

Motion Assessment

AROM: lumbar extension and lateral flexion restricted by paraspinal guarding; hip extension restricted bilaterally (psoas shortening); hip internal rotation may be limited by pelvic floor and adductor hypertonicity; trunk rotation relatively preserved unless thoracolumbar guarding is severe
PROM / end-feel: lumbar extension has a guarded/protective end-feel (muscle spasm, not bony block); hip extension limited with a firm muscular end-feel (psoas shortening); Thomas test positive bilaterally — thigh does not reach table; end-feel improves with sustained positioning (tissue relaxation rather than structural block)
Resisted testing: hip flexion strong but painful (psoas involvement); hip adduction strong but tender; core stability may be compromised (difficulty maintaining neutral spine during resisted testing) from chronic abdominal guarding patterns; lumbar extensors strong but fatigable

Special Test Cluster

The SOT cluster for endometriosis is oriented toward confirming the MSK compensatory pattern and screening for differential diagnoses rather than diagnosing the pelvic condition itself — diagnosis requires laparoscopy.

Test	Positive Finding	Purpose
Thomas Test (CMTO)	Thigh does not reach table; inability to fully extend hip with contralateral hip flexed — indicates psoas/iliacus shortening	Confirm hip flexor contracture from chronic pelvic guarding
Lumbar AROM (Flexion/Extension/Lateral Flexion) (CMTO)	Restriction in extension and lateral flexion with protective muscle guarding end-feel	Quantify lumbar mobility loss from T10–L2 viscerosomatic reflex
SIJ Provocation (FABER/Patrick's Test) (CMTO)	Groin or pelvic pain with combined flexion-abduction-external rotation — may reproduce deep pelvic pain	Differentiate SIJ dysfunction from referred pelvic visceral pain; pain in the groin rather than SI joint suggests visceral referral
Ober's Test (supplementary)	Thigh does not adduct past midline — indicates ITB/TFL tightness	Identify lateral hip compensatory tightening secondary to altered gait
Slump Test (CMTO — rule out)	Reproduction of radiating leg pain with neural tension positioning — if positive, suggests lumbar radiculopathy rather than referred pelvic pain	Rule out lumbar disc pathology mimicking endometriosis-related low back and leg pain

Timing matters: Assessment findings fluctuate with the menstrual cycle. Reassess during both menstrual and non-menstrual phases to distinguish cyclical viscerosomatic reflex changes from persistent structural compensation.

Differential Assessment

Condition	Key Distinguishing Feature
Primary Dysmenorrhea	Pain limited to menstrual period with full resolution between cycles; no progressive worsening; responds well to NSAIDs; no pelvic adhesions or infertility
Pelvic Inflammatory Disease (PID)	Acute onset with fever, purulent vaginal discharge, cervical motion tenderness; often post-STI; medical referral for antibiotic treatment
Ovarian Cyst (Ruptured)	Sudden unilateral pelvic pain, not cyclical; ultrasound confirms; emergency referral if acute abdomen
Irritable Bowel Syndrome	Abdominal pain related to bowel habits (improves with defecation); no cyclical menstrual correlation; no dyspareunia; Rome IV criteria
Lumbar Radiculopathy	Dermatomal pain distribution with positive SLR and neurological deficit (sensory, motor, reflex changes); not cyclically related to menstruation

CMTO Exam Relevance

Classified as a reproductive/gynecological condition affecting MSK treatment planning — expect MCQ questions on treatment modifications, not diagnosis
Deep intrusive abdominal work is contraindicated — this is a high-frequency exam item
The viscerosomatic reflex (T10–L2) producing thoracolumbar paraspinal guarding is a testable concept linking visceral pathology to MSK presentation
Differentiate progressive dysmenorrhea (suggests endometriosis) from stable primary dysmenorrhea (prostaglandin-mediated, responds to NSAIDs)
Adhesion formation affecting fertility is commonly tested as a complication
Catamenial pneumothorax is a rare but exam-notable red flag associated with endometriosis
Know that laparoscopy is the gold standard for definitive diagnosis — not within MT scope

Massage Therapy Considerations

Primary therapeutic target: musculoskeletal compensatory effects of chronic pelvic pain — specifically the psoas hypertonicity, thoracolumbar junction guarding (T10–L2 viscerosomatic reflex), lumbar paraspinal tension, hip adductor hypertonicity, and compensatory gait patterns. Massage therapy does not treat the endometrial implants or pelvic adhesions but can significantly reduce the MSK burden they produce.
Sequencing logic: address the thoracolumbar junction and lumbar paraspinals first to reduce viscerosomatic reflex-driven tone, then progress to psoas and hip flexor release — attempting psoas release while the central reflex is still active will meet persistent guarding. Abdominal work (if appropriate) comes after paraspinal and hip work to ensure the protective guarding has been addressed peripherally first.
Safety / contraindications: deep intrusive abdominal work is contraindicated — risk of aggravating peritoneal adhesions and underlying inflammation; gentle superficial abdominal effleurage and myofascial release of the external obliques is acceptable with informed consent. Avoid deep pelvic or inguinal work. Treatment during acute menstrual flare should be lighter and focused on comfort and pain modulation rather than aggressive tissue change. If the client has a known endometrioma, vigorous techniques near the abdomen carry risk of cyst rupture.
Heat/cold guidance: moist heat to the low back and thoracolumbar junction is beneficial (reduces viscerosomatic reflex-driven guarding and provides analgesic effect); heat to the lower abdomen provides comfort and reduces cramping during menstruation; avoid cold application to the abdomen during menstruation (may increase cramping). Heat combined with positioning (supine, hips and knees flexed) is particularly effective pre-treatment.

Treatment Plan Foundation

Clinical Goals

Reduce thoracolumbar junction (T10–L2) paraspinal guarding and restore segmental mobility
Restore psoas length and hip extension range (improve Thomas test findings)
Decrease lumbar ROM restriction, particularly in extension and lateral flexion
Reduce compensatory hip adductor and pelvic floor tension

Position

Begin supine with bolster under knees (shortens psoas, reduces abdominal tension, promotes relaxation) for abdominal and anterior hip work
Transition to prone with abdominal bolster (reduces lumbar lordosis and abdominal pressure) for posterior chain work — if prone is not tolerated due to pelvic pain, use side-lying
Side-lying is an alternative throughout for clients experiencing significant pelvic discomfort

Session Sequence

General relaxation — effleurage to the posterior trunk and lower extremities to establish baseline tissue response and reduce global sympathetic tone
Thoracolumbar junction release (T10–L2) — sustained myofascial release and deep longitudinal stripping of the paraspinals from T10 to L2; focus on the viscerosomatic reflex zone; this is the gateway to reducing downstream psoas and pelvic guarding
Lumbar paraspinal release (L2–S1) — progressive deep work along the erector spinae and multifidus, emphasizing areas of chronic fibrotic guarding; cross-fiber techniques to the quadratus lumborum
Gluteal and lateral hip release — sustained compression and myofascial release to gluteus medius, piriformis, and TFL; address compensatory lateral hip tension from altered gait; reactivate inhibited gluteal muscles
Psoas release (supine) — gentle sustained compression through the abdominal wall lateral to the rectus abdominis, angled posteriorly toward the iliac fossa; maintain within pain-free tolerance; combine with slow passive hip extension to encourage lengthening [only with informed consent and client comfort]
Hip adductor release — myofascial release and sustained compression to the adductor group, particularly at the pubic ramus origins; address secondary trigger points
Superficial abdominal myofascial release — gentle, broad-handed myofascial work to the external obliques and rectus sheath; no deep intrusive work; release fascial restrictions contributing to abdominal wall guarding [not during acute menstrual flare]
Reassess — Thomas test for psoas length, lumbar extension AROM, palpate thoracolumbar junction tone; compare to pre-treatment findings

Adjunct Modalities

Hydrotherapy: moist heat to the thoracolumbar junction (pre-treatment) to reduce paraspinal guarding and improve tissue pliability before deep work; moist heat to the lower abdomen (pre-treatment or intra-treatment, supine) for comfort and cramping relief; post-treatment cool pack to the low back only if reactive soreness develops
Remedial exercise (on-table): PIR (post-isometric relaxation) to the psoas — client performs gentle hip flexion against resistance, then relaxes into passive hip extension; repeat 3–4 cycles to restore hip extension range. Diaphragmatic breathing with sustained exhalation to facilitate pelvic floor relaxation and reduce abdominal guarding.

Exam Station Notes

Demonstrate awareness that deep abdominal work is contraindicated — verbalize this before beginning any anterior trunk work
Show thoracolumbar junction assessment as part of the clinical reasoning for lumbopelvic guarding — link the viscerosomatic reflex (T10–L2) to the presenting MSK pattern
Perform Thomas test as your primary reassessment measure — this shows measurable outcome evaluation
If asked about positioning, state the rationale for knee bolstering (reduces psoas tension and abdominal pressure)

Verbal Notes

Sensitive area access: "I'd like to work on your hip flexor muscles, which attach deep in your abdomen. This area can be sensitive — I'll work gently and check in with you frequently. Let me know immediately if you feel any deep pelvic discomfort, and I'll adjust or stop."
Menstrual cycle timing: "Some clients find treatment more comfortable between periods rather than during — we can adjust scheduling to find the timing that works best for your symptoms."
Post-treatment effects: "You may notice some increased awareness of your low back and hip area after treatment as your muscles adjust. Gentle walking and warmth to the area can help if you feel any soreness."
Bathroom access: "Please let me know at any time if you need a break to use the bathroom — we can pause treatment without any issue."

Self-Care

Supine knee-to-chest hold (bilateral) to gently stretch the psoas and decompress the lumbar spine — hold 30 seconds, repeat 3–4 times daily, especially during menstrual flares
Supported bridge (supine, feet on floor, lift pelvis gently) to activate inhibited gluteals and counteract psoas dominance — hold 10 seconds, repeat 10 times
Diaphragmatic breathing practice (5 minutes, 2–3 times daily) with focus on slow exhalation to reduce pelvic floor hypertonicity and abdominal wall guarding
Moist heat application to the low back and lower abdomen during menstrual exacerbations (15–20 minutes) for symptom management

Key Takeaways

Endometriosis produces sustained lumbopelvic muscle guarding, psoas hypertonicity, and thoracolumbar junction tension (T10–L2) through the viscerosomatic reflex — the MT treatment target is these MSK compensatory effects, not the pelvic pathology itself
Deep intrusive abdominal work is contraindicated due to risk of aggravating peritoneal adhesions and underlying inflammation
The Thomas test is the primary assessment and reassessment tool for documenting psoas shortening from chronic pelvic guarding
Treatment sequencing starts at the thoracolumbar junction (viscerosomatic reflex zone) before progressing to the psoas — addressing the reflex arc first reduces downstream guarding
Cyclical symptom fluctuation with menses is the hallmark that distinguishes endometriosis-related MSK patterns from primary lumbar or hip pathology
Progressive dysmenorrhea (worsening over years, not responding to NSAIDs) is the key clinical indicator differentiating endometriosis from primary dysmenorrhea
Catamenial pneumothorax (cyclical chest symptoms during menstruation) is a rare but exam-notable red flag