Does gas x cause rashes? and i have a bubbly sound feeling in stomach with or without eating is this a sign of colon cancer?

I don't know what gas x is but exposure to something you are allergic to can certainly cause a rash. As far as bubbling in your abdomen, its called peristalsis where the intestines contract and relax like an accordion to move stuff along. This is entirely normal. Nevertheless, you are almost 40 years old and due for your first colonoscopy to screen for colon CA. This is the only sure way to tell.

Dr Kuitems agreed

Gas-x is simethicone and should not cause rashes. Best is to see if the rash disappears when uou stop t. Your symptoms are not that of cancer of the colon.