Symptoms, burping, flatulence after eating, abdominal pain, metalic taste in mouth, red blood when wiping after defection. is this cancer?

Symptoms: Hello -- I understand that your symptoms are uncomfortable, and I suggest a good evaluation with your primary care physician to figure out their cause. Especially when you have rectal bleeding for any reason. This can be from hemorrhoids, but you need an exam to tell. Cancer cannot be ruled in or out from what you've shared so far. I hope you feel better soon!