Grandpa's death certificate

Today (well, some time in the past few days) I got my grandfather's death certificate in the mail.

What I learned that I didn't have before:
Occupation, time at job, and employer (He was a "vulcanizer" in my dad's birth certificate and a "sheet metal worker" in his death certificate)
Address at time of death (I don't believe this residence is still connected to our family, the address doesn't look familiar)
Hospital at which he died (which is the same one where I was born)
Date of burial
Funeral home

What I need to work on:
Cause of death. It's handwritten in doctor writing. "upper gastrointestinal k...... d..to ..." then another two lines of additional things I can't read.

I'll scan it later and see if someone can help me decipher it. =)