[header] How to treat tumors in hamsters [title] Talk with your vet about surgical treatment. [step] After your vet has diagnosed a tumor in your hamster, talk with them about how to treat the tumor. For external tumors (located on the skin), surgery is the best treatment option. 
For internal tumors (inside the body), though, surgery would be more challenging because of a hamster's small size and tiny internal organs. [substeps] Your vet can help you determine whether surgery would be a good treatment option for your hamster.