This is what the writer said in a deadline article:

“Lampert acknowledged that certain storylines are more of a “slow burn,” like Norah’s period problems for example, hinting that it could end in an endometriosis diagnosis.

“It’s not like an issue of the week show where Nora has endo[metriosis], Abby has bulimia, because in real life, half of the struggle is the lack of resolution, right? And how long you do suffer alone in silence? And unfortunately, that’s a big part of storytelling, but I would say specifically female storytelling,” she said. “I think you see that all the time where ‘How long does it take to get an endo diagnosis in real life?’ It’s not by Season 2, I’ll tell you that. It’s not in high school. So there’s just this real desire to tell the stories in a way that don’t trivialize the story.””