Mucositis?: These don't sound like symptoms of sinusitis. Maybe viral pharyngitis. But you may be on the right track, i.e. oral mucositis (inflammation of mucous membranes of the mouth), a well known side effect of many chemotherapeutic drugs, including methotrexate. Discuss with the doctor who prescribed it. http://www.ncbi.nlm.nih.gov/pubmed/23601229
Answered 9/18/2015
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