Endometriosis

What Is Endometriosis?

Endometriosis is a condition where tissue similar to the uterine lining grows outside the uterus — on the ovaries, fallopian tubes, bladder, bowel, and beyond. This tissue responds to hormonal cycles, causing inflammation, scarring, and adhesions. But its impact extends far beyond the reproductive system.

Endometriosis is a systemic disease. It disrupts immune function, creates chronic neurological changes through central sensitisation, disturbs sleep architecture, and — for many patients — creates patterns that closely mirror other conditions in this cluster: UARS, CPTSD, and PMDD.

The 9-Year Wait — and Why It Keeps Getting Longer

The average time from first symptoms to confirmed diagnosis in the UK is now 9 years and 4 months — up from 8 years in 2020. Globally the average is 6.6 years, with documented cases of 27-year delays in the UK. Four or more doctors are typically seen before diagnosis.

The dismissal patterns are consistent: "Painful periods are normal." "You're being dramatic." Misdiagnosis as IBS or anxiety. Diagnostic laparoscopy resisted until the patient has fought for it for years. This is not a failure of individual doctors — it's a systemic failure to take women's pain seriously.

Central Sensitisation — Why Pain Doesn't Stop After Surgery

This is the most important thing many endo patients are never told. Endometriosis lesions grow nerve fibres directly into the surrounding tissue. Over years of chronic nociceptive input, the nervous system undergoes structural changes — dorsal horn neurons in the spinal cord become hypersensitive, and pain-processing regions in the brain are altered.

The result is central sensitisation: the nervous system has been reprogrammed to amplify pain. Once this is established, removing the lesions doesn't automatically undo the neurological changes. Many patients continue to experience pain after successful excision surgery because the pain amplification system has become self-perpetuating.

"Even after complete surgical removal of all endometriosis, pain can persist because the amplified pain signalling within the central nervous system remains even after the peripheral trigger has been eliminated."

The Endo-UARS Connection

A striking research finding: 46.6% of patients with hypermobile connective tissue disorders (hEDS) have sleep-disordered breathing — and the mechanism is specifically Upper Airway Resistance Syndrome, caused by abnormally flexible airways. Endometriosis co-occurs with hypermobility disorders at rates significantly above the general population.

The broader cluster — endometriosis, hypermobility, dysautonomia (POTS-like symptoms), fatigue, and UARS — is real and documented. If you have endo and unexplained fatigue that doesn't respond to endo treatment, sleep-disordered breathing is worth investigating.

Sleep in Endometriosis

Six out of seven Pittsburgh Sleep Quality Index domains are significantly worse in endo patients compared to controls. The relationship is bidirectional: pain disrupts sleep, and poor sleep lowers pain thresholds, creating a vicious cycle. Research has shown that worse sleep quality on a given night correlates with significantly higher pain the following day.

Excision vs Ablation — What Patients Need to Know

This is one of the most consequential treatment decisions in endometriosis care:

• Ablation — burns or destroys the surface of lesions. Does not remove deep or infiltrating endometriosis. Higher recurrence rates. This is what many surgeons offer because it's faster.
• Excision — surgically removes lesions entirely, including deep infiltrating disease. Significantly better long-term outcomes. Requires a specialist excision surgeon.

Many women undergo ablation multiple times before being told excision exists. Advocating for excision surgery — and finding a surgeon who specialises in it — is critical.

Trauma, Medical Gaslighting, and CPTSD

Years of being told your pain is normal, psychosomatic, or exaggerated constitutes medical trauma. The experience of having a very real physical condition dismissed repeatedly by authority figures replicates the dynamics of many traumatic experiences. It is not uncommon for endo patients to develop PTSD or CPTSD symptoms as a result of their diagnostic journey — before any other trauma is considered.

This matters for treatment: central sensitisation responds better to approaches that address nervous system dysregulation, not just the pelvic pathology. Pelvic floor physiotherapy, somatic therapy, and pain neuroscience education are all evidence-based components of comprehensive endo care.