The goal of this clinical trial is to learn if light therapy can prevent and/or treat mouth sores in children with cancer. The main questions it aims to answer are: Is it reasonable and acceptable to provide light therapy for children with cancer? Does light therapy prevent and treat mouth sores related to medical treatment? Researchers will compare children who did not receive light therapy before the clinical trial to children who receive light therapy during the clinical trial to see if light therapy helps to prevent and treat mucositis. Participants will: * Tell the nurse their pain score, related to their mouth sores, before receiving light therapy. * Have picture taken of their mouth to look for mouth sores. * Receive light therapy every other day while admitted to the hospital on the cancer unit or while admitted to an alternate unit.
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Evaluate the feasibility and acceptability of using PBM in pediatric oncology patients.
Timeframe: From date of enrollment until date of last PBM treatment, assessed up to 2 years.