Mucocitis causes ulcers too, as well as other oral conditions, some quite common with treatment, but you're doing the right thing by keeping on top of it, visiting urgent care, and letting your treatment team know. You had me laughing, not thats its it's funny, but ironic, everything seems to happen at night and on weekends! That's why I keep an arsenal of meds ready lol. Good question everyone should ask the treatment center, who do I contact off hours? I had a list of numbers for chemo, but not always or everywhere I was treated. If in doubt, there is always the ER.