Hi and welcome to the forum! I am glad that I can help you.
You want to know the cause of the pain that you experience in the flank and how you can treat it.
Pain in the back side of the flank may appear due to kidney infections or kidney stones. Kidney infections usually appear as a result of kidney stones or urine reflux. This condition is characterized with increased body temperature, a frequent need to urinate, changed urine and pain in the back side of the flank. Kidney stones appear as a result of sedimentation of oxalate from the urine and may appear in individuals who are often dehydrated or are immobilized. The kidney stone may be located in the part of the kidney called the pelvis or may be passed down the ureter. In the second case there is a characteristic pain that begins from the back side of the flank and radiates to the front and down towards the genital area. The pain is pulsating, from mild to severe.
Given the data that you described, you may experience one of the conditions listed above. You may consider having a bacterial culture with an antibiogram to rule out kidney infection. You may also need to have a native RTG of the abdomen to rule out possible kidney stones. In case of infection you may need to take antibiotics according to the antibiogram results. In case of kidney stones take great amounts of cranberry tea or juice to provoke the urine production to release the stones, and also you may take NSAIDs for treatment of the pain.
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