<s>[INST] my son 10 years old having recurrent low grade fever for last couple of months .he is very active but hate to eat any thing except of junk food . he is very slim & mostly complains about nasal congestion in night time . he also complain about pain in bones but not a specific area [/INST] Prolonged fever , bone pain and weight loss and poor apetite are signs of serious illness, physical exam is highly advisable to role out pulmonary disease or enlarged lymph nodes , I highly recommend doing complete blood count , ESR, vlood film and chest XRAY. </s>