my son who is 7 has been experiencing problems putting on weight but has been steady at the 50th percentile for a few years now has been very tired lately and complaining of behind his knee hurting for several months.  finally my doctor examined him today (they were writing it off as growing pains) found a lump behind his knee where the pain is.  his blood work came back normal except his thyroid is a tab elevated.  she is sending him for an xray but not telling me anything.  could this be cancer?  what could it be?  i am so scared right now.
Hi, With this limited information it is difficult to say anything regarding the possible diagnosis. The best thing to do right now is the X-ray and that is ordered by your doctor. So you should be patient until the report came. Follow your doctors advise. Take care.