Mucositis Oral

The goal of this clinical trial is to learn if light therapy can prevent 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 mouth sores related to medical treatment? Researchers will compare children who do not receive light therapy to children who do receive light therapy during the clinical trial to see if light therapy helps to prevent mucositis. Participants will: * Complete a survey. * Have picture taken of their mouth to look for mouth sores. * Receive light therapy every day while admitted to the hospital on the cancer unit or while admitted to an alternate unit, and continue to receive light therapy in the home setting until they reach 8 days after the start of their chemotherapy cycle.

This mixed-methods pilot study will examine the effect of music therapy on oral mucositis pain in pediatric oncology patients. Oral mucositis, characterized by painful ulcerative lesions in the mouth, is a common side effect of high-dose chemotherapy and hematopoietic stem cell or bone marrow transplantation. Despite its high prevalence and impact on quality of life, effective pain management strategies for pediatric oral mucositis remain limited and often rely heavily on medications that may cause significant side effects or provide insufficient relief. Music therapy may offer a promising non-pharmacologic adjunct for reducing pain, yet no studies to date have specifically evaluated its use for oral mucositis pain in pediatric patients.

The goal of this interventional study is to see if the daily use of red light therapy called photobiomodulation can help sore skin and sore mouths in children having radiotherapy. All children aged 0-16 years old who are receiving either proton or photon radiotherapy treatment, except to the brain only, will be asked if they would like to join the study. The main questions it aims to answer are: 1. Does the use of red light therapy help the skin side effects in children and young people undergoing proton or photon therapy? 2. Does the use of red light therapy help the mouth side effects in children and young people undergoing proton or photon therapy in the head and neck area? Researchers will compare the patients enrolled on to the study with a like for like historic patient to see if red light therapy improves the sore skin and sore mouths caused by proton or photon therapy. Participants will have a daily treatment with red light therapy alongside their daily proton or photon treatment fraction.

To assess the efficacy of preventive Low-Level Laser Therapy (LLLT) for reducing the incidence of WHO's grade 3-4 oral mucositis in children and young adults receiving chemotherapy regimens associated with a high rate of mucositis: conventional chemotherapy or High Dose Chemotherapy (HDC) conditioning regimens with Hematological Stem Cell Transplantation (HSCT).