Endometriosis
Endometriosis is a common condition where small pieces of the womb lining (the endometrium) are found outside the womb.
The exact cause of endometriosis is unknown, but there are several theories.
Endometriosis can be difficult to treat. The aim of treatment is to ease the symptoms.
The main complication of endometriosis is difficulty getting pregnant (subfertility) or not being able to get pregnant at all (infertility)