<s>[INST] my 18 year old son has been waking up with really bad pain in his right adomal area for a couple of weeks. i took him to accute care, they checked his apendex and did some blood work. he had some unexplained fluid in his abdomal area.they said it should absorb into his blood stream. he is still sick and has lots of pain. it seems worse in the mornings. can u help? [/INST] Please do mention other reports as well to receive better suggestion from HCM. There has to be reason behind bad pain.Collection of fluid and pain together suggest of some pathology in abdomen which the sensory system is experiencing.Was his ultra sound whole abdomen done? If yes please fill in with detail findings. If not then get it done.He may be suffering from a most common worm infestation or acid peptic syndrome or any liver pathology or may be  even abdominal Kochs. Please get detail investigation done and see your doctor. </s>