What was she coughing up in the hospital?

And fishing line?

Yes, I believe it was seaweed she took in while screaming and trying to breath underwater.

Such an old thread, but that was a weird scene.
The lady next to them suddenly starts coughing up...something, it looks like blood. Then Mom suddenly starts coughing up something, looks like blood...the music is swelling, it suddenly looks like we're watching a horror movie, OMG wtf is happening, WTF IS GOING ON HERE, the music crescendos, its throbbing, hammering...her kid is screaming, "STOP IT, STOP IT MOMMA!!" bloody horror, OMG OMG...something comes out of Mom's mouth...what the hell is that, what could it be??
She's done coughing...she lays down and closes here eyes. End scene.

I don't know about anyone else, but I was sitting here like...what the living hell was that all about? No explanation to what she coughed up...why it was that she began coughing at the exact same time as the neighbor lady...
That scene was weird as hell, it made zero sense. Like it'd been too long since the last dramatic moment so they just did a half-ass job in creating one.

Samara's (from The Ring) hair