<s>[INST] Im 35years old in good health just went to ER was diagnosed  with kidney stones I was in severe pain.  Took medications within24hrs passed kidney stones feel better but CT scanning said theres 4 more still around mite not notice for awhile. But still tired and my wife said in the passed year that it looked like I lost some weight.  What could be the cause of weight loss. [/INST] Hi, thanks for using Chat Doctor Weight loss can be intentional or unintentional. If you have not modified your diet or increased your level of activity in an attempt to lose weight then you need to see your doctor for an assessment. Unintentional weight loss can be related to any chronic (longstanding) illness, kidney or heart disease, cancer, infection, stress, high levels of thyroid hormone. Your doctor would take a full history and examine you for any conditions that could contribute to your weight loss. The initial investigations would likely be a full blood count, ESR (checks for inflammation in the blood, stool samples for occult or hidden blood, thyroid function tests, liver function tests and creatinine levels to check the kidney. I hope this helps </s>