Is it possible for a person to be diagnosed with two different types of cancer at the same time?

Yes: It is and happens from time to time.

Yes, but rarely: If someone is diagnosed with two different cancers at the same time, or even within a year or two, it raises a red flag for me. I always want to make sure that both cancers are truly different, because statistically, it's more likely to have one cancer that has spread to another place. Make sure your doctor knows about any past cancer so she or he can make the right diagnosis!