Abby Lee Miller Details Docs Brushing Off Her Pain, Catheter Later Found in Body

Abby Lee Miller is spilling all to us about her lawsuit against Cedars-Sinai Marina del Rey Hospital -- recalling how after years of unbearable pain following her 2020 surgery, she finally discovered a catheter had been left inside her body the whole damn time.

We caught up with the "Dance Moms" star leaving Heather McDonald's 'Juicy Scoop' event in L.A. last week -- and she went off about how she kept sounding the alarm about her pain, but was completely ignored … until a dermatologist saw a giant pimple and told her it was a sign something foreign was stuck inside her.

You have to watch the video -- the way Abby tells it, her pain was brushed off again and again, and honestly, it’s a frustrating account as she lays it all out.

Abby really drives the point home -- saying she was completely ignored, just like she was before doctors finally caught her Burkitt lymphoma diagnosis ... a rare and aggressive form of non-Hodgkin lymphoma.