Diagnosis
What do endometriosis stages I–IV actually measure?
The short answer
Endometriosis stages I to IV mainly describe the visible amount and distribution of disease and scar tissue seen and scored at surgery. They do not directly measure pain or its effect on daily life, so someone with low-stage disease can still have severe symptoms.
Endometriosis stages I through IV mainly describe the visible amount and distribution of disease and scar tissue (adhesions), based on what’s seen and scored at surgery, most often during laparoscopy. Staging is an anatomic scoring system, not a direct measure of how much pain someone has or how their symptoms affect daily life.
Because staging doesn’t reliably capture nerve involvement, deep organ infiltration, or how inflammatory a lesion is, someone can have low-stage disease and still have severe symptoms. For deeper disease patterns, additional mapping systems (such as ENZIAN) and high-quality, endometriosis-focused imaging can provide a more meaningful picture. If you’re feeling dismissed because your stage doesn’t match your pain, our team can help interpret your findings in context and discuss which evaluation and treatment options make sense for your specific goals.
Where to go from here
Understand it, compare it with what you're feeling, then talk it through with us.
Understand
Understand the condition
Compare
Symptoms it can relate to
Speak with Us
Confused About Your Endometriosis Stage?
Understanding your stage helps clarify your diagnosis but doesn’t always reflect your pain or symptoms. Our specialists can explain what your staging means and guide personalized care options.
Questions people ask next
All diagnosis questionsDoes endometriosis stage predict pain severity?
Endometriosis stage does not reliably predict pain severity. Stages mainly describe what’s seen at surgery, so someone with low-stage disease can have debilitating symptoms, while someone with more extensive disease reports surprisingly little pain.
What is the Enzian score for endometriosis?
The Enzian score describes where deep infiltrating endometriosis is located and how extensive it is. It helps surgical teams plan imaging, surgery, and support from multiple specialties when organs such as the bowel, bladder, or ureters may be involved.
What is the AAGL endometriosis classification system?
The AAGL endometriosis classification system is a standardized way surgeons describe where endometriosis is found at surgery, how extensive it is, and how complex it appears. It is meant to better capture deeper disease that may affect surgical planning.
Standard pelvic ultrasound vs endometriosis-focused scan: what’s different?
A standard pelvic ultrasound surveys the uterus and ovaries, while an endometriosis-focused scan uses targeted imaging and checks how pelvic organs move against each other. A standard scan may miss deep disease or scarring; a focused scan can help with surgical planning.
Further reading
Your Symptoms May Point to a Specific Endometriosis “Type”
Discover how your symptoms may reveal a specific endometriosis type. Learn about phenotypes and adenomyosis in our latest research article.
Different Types of Endometriosis Pain and What Helps
Learn how endometriosis pain can feel, what may drive each pattern, and which assessment and treatment options to discuss with your doctor.
Deep Infiltrating Endometriosis: Current and Future Treatments
Deep infiltrating endometriosis: symptoms, causes, diagnosis and treatment. Medical therapy, ICG-guided surgery, stenting, pathology, and future outlook.
