Docs, when stretching for splits, i get a pain in my hip joint. how can i stop it?

Consider stopping: Significant hip joint pain while doing an extreme stretch can potentiate further problems. I would question the value of continuing to do the splits/stretch. There is something called femoral acetabular impingement that can result in tearing your acetabular labrum. If stopping the stretch does not resolve the pain then i would see a good local sportsmedicine specialist.