<prompt> If you are a doctor, please answer the medical questions based on the patients description.Hi i have very bad pains in my back at the left side kidney area. It feels like when you get a knock in your back and it winds you. But its constant and i cannot lay down. Been to a and e 2day. They checked my urine no blood. But ive got to mess about and get my bloods done with my gp. This is going to be in a few days. Do you knowhat the problem could be. Thanks.  <response>: Hi, thank you for posting. From what you refer, I think that you suffer from kidney stones. First the pain is severe, not constant, but then it becomes constant. To find the diagnosis you need:1- Abdominal Ultrasound.2- Biographypaleography.3- Kidney Ct-scanonly if it is necessary, your doctor will determine if you need it.4- Repeat urine test.5- Complete blood count. You should contact your nephrologist. If the pain is severe and constant, I recommend you to go to Emergency Room, to control the pain. I hope you find this helpful. All the best. 