It's associated with a higher risk of fibroids as well as more inflammatory compounds in the uterus during menstruation.
It's not as widely known compared to other menstrual health conditions.
Adenomyosis can be fairly asymptomatic (in around 30% of people). It can also be quite symptomatic. There's a broad spectrum. Symptoms can look fairly similar to endometriosis symptoms:
heavy period flow or prolonged flow
clots in menstrual blood
period pain
mid-cycle spotting
chronic pelvic pain
painful penetrative intercourse
sub- or infertility
Adenomyosis is diagnosed through transvaginal ultrasound or MRI. Usually, ultrasound is the starting point for investigating gynaecological and menstrual issues. Sometimes, an enlarged uterus on ultrasound prompts further investigation in the absence of other findings on the image; this is because an enlarged uterus is associated with adenomyosis.
Here are some of the risk factors:
past abortion
C-section history
higher parity (higher amount of pregnancies and births)
tissue removal from the uterus in the past
age
It really depends on what (y)our goals are and what you're experiencing.
There are lots of conventional and naturopathic options out there, but it really depends on what we're hoping to accomplish with treatment: support fertility, decrease heavy bleeding, improve pain, etc.
Chapter 18 of "The Period Literacy Handbook" talks about adenomyosis in a bit more details and has some considerations for treatment as well.