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What are reasons for my kidneys to be hurting?

I'm a 33 year old female. Very suddenly yesterday evening, my left kidney started hurting. The pain started out as an annoying pain, but then it started intensifying over the next 30 minutes. I started to feel awful and extremely nauseous. Fearing that I was getting a kidney infection, I drank several glasses of water and cranberry juice. I then went to sleep and woke up today feeling fine, with no pain in my left kidney. Over the last month I extremely changed my diet, cut out all fattening and high caloric foods and I have lost 10 pounds. I used Alli for about 2 weeks and then discontinued using it. Ever since I changed my diet, I have not been drinking the usual amount of 5 glasses of water a day that I usually drink. Is it possible that I was getting a kidney infection, or could there be something else causing the pain?
Sudden pain is always of concern, especially if it worsens or persists or is accompanied by other concerning symptoms, like fever or nausea and vomiting. I recommend talking to your primary care doctor as soon as possible. One concerning possibility would be kidney stones. These manifest as severe pain in the flank which moves into the abdomen and down the leg, sometimes to the groin. Classic of kidney stone pain is that it is crampy in nature and comes and goes, with periods of severe pain alternating with episodes without pain. I am particularly concerned about this possibility, because kidney stones sometimes occur more frequently in people who are experiencing rapid weight loss or dieting. Another would be a kidney infection, also known as pyelonephritis. This usually begins as a urinary tract infection with the typical symptoms of burning with urination and then progresses. Kidney infections have severe pain in the abdomen or in the lower back just under the ribs. Often there is fever as well. It sounds like you should call your primary care doctor as soon as possible to help you figure out what is going on. If fever or severe pain returns, you should go instead to the emergency room.
This answer is for general informational purposes only and is not a substitute for professional medical advice.
If you think you may have a medical emergency, call your doctor or (in the United States) 911 immediately. Always seek the advice of your doctor before starting or changing treatment. Medical professionals who provide responses to health-related questions are intended third party beneficiaries with certain rights under ZocDoc’s Terms of Service.

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