<s>[INST] Hi, I am wondering if I may have kidney stone/s.  The vague symptoms started 2 days ago.  My first symptom was extreme thirst, which I still have.  I woke yesterday feeling very unwell with chills and vomited later in the day.  I had severe lower back pain which is now concentrated just under my ribs on the right side.  I still feel very sick and the pain is a constant throb which becomes worse when I walk.  I am going to the toilet a lot even though may times I cannot pass any/much urine.  I do not appear to have any blood in my urine. [/INST] HelloThis type of chills and vomiting with severe back may be due to as.1 Urinary tract infection , diagnosis can be confirmed by urine examination in lab.2 Right renal colic may be the nest reason , but symptoms are not an indication of renal stone ,because in renal stone pain present with vomiting and blood in urine ( usually).Diagnosis can be confirmed by ultrasound of kidneys.3 As you mentioned that there is extreme thirst so all these symptoms may be due to renal failure but least chance due to short duration of history of illness.Any how consult a physician and get his consultation as physical examination is important.Good luck. </s>