Hi my mum has stage 4 lung cancer left lung right lung and lymph nodes.shes had it nearly 3 years .3 rounds chemo and 2 years of immunotherapy .she has been wonderful in till 7 week ago when severe pain constipation for 2 weeks fatigue no appetite and in bed all day. She was admitted to hospital with constipation and had x-ray st scan blood tests all came back with no abnormalities .she had 2 enemas to clear bowels which appeared successful .now been discharged from hospital and now's she's home she is still in pain no appetite and can't do every day tasks .cancer is stable and not spread .desperate to hear what could be wrong when tests don't show anything wrong .