I have Leukemia, I have had mouth sores at various times but not prolonged. As of recently I am starting to experience more frequent hoarse voice and its neither comfortable or convenient, as I am a motivational speaker and life coach. I do hope you get the answers and support you need. Most of all, please follow-up with your doctor if there is a serious concern and/or discomfort. ~Leya Elijah-Team Member~