I have a bump on the left side of the roof of my mouth. i want to know if this could possibly be cancer?

Go to your doctor: A bump on the roof of your mouth is probably nothing but who can tell from this question. If you have an issue with a mass in your mouth, you need to see a doctor or a dentist now.

See a doctor: Please see your doctor. You may need to see an oral surgeon for a biopsy etc if the bump looks suspicious.

Possible: There is insufficient information to provide a better answer. It would be prudent to consult your doctor if you have any suspicion.