Are all tumors cancerous?

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No. Some are benign, which means they probably should be removed but also means they are not yet cancerous. If you think you have one I strongly urge you to seek a Doctor and have it checked out.

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No, some tumors can simply be fatty tissue. I am not a doctor, but my pet dog has 2 fatty tissue tumors and they're not cancerous.

First answer by Barney9. Last edit by Marcy. Contributor trust: 8937 [recommend contributor recommended]. Question popularity: 79 [recommend question].