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Why are you on these medicines when tests for Crohn's is negative. Methotrexate
can cause diarrhoea
frequently. If the diarrhoea is severe and you are also experiencing burning sensation on passing urine and dry mouth
you need to go to Hospital for fluid therapy
. Till then drink plenty of fluids like water and mild juice like lemonade. Do you feel very tired often, any pain behind neck which increases when certain points are pressed on the back of neck.