Yes, I have. In 2006, I was hospitalized for two weeks with DVT and PE, while also in a UC flare. No one ever attributed it to the UC. I was found to have Factor V Leiden, though, a mutated gene that can cause blood to clot. I'm on Coumadin for the rest of my life.
Ulcerative Pancolitis (dx'd 6/2002)
Prednisone (currently at 5mg/day, tapering by 2.5mg every 2-3 wks)
Aranesp injection every week for anemia
6-MP (discontinued as it lowers my white count)
various meds for other conditions