Final answer:
Adenomyosis is frequently underdiagnosed due to its similar symptoms to other pelvic pain conditions.
Step-by-step explanation:
Adenomyosis is frequently underdiagnosed because it has similar symptoms to other pelvic pain conditions. Many of the symptoms of adenomyosis, such as pelvic pain and heavy menstrual bleeding, can also be present in conditions like endometriosis or fibroids. This similarity in symptoms can make it challenging to differentiate adenomyosis from other conditions without further diagnostic tests.