My Mum has recently been given a lung cancer diagnosis (untreatable due to frailty).  She also has CKD stage 4 and been in remission for lymphoma for about 7 years.  She is always tired and can sleep for hours and then naps when she gets up.  However, recently she has begun to be slightly confused and very forgetful.  Is this just her age (88 next month) or could the lung cancer be adding to this?  She does not take any additional medication following the lung cancer diagnosis.