Kidney cysts are pouches of fluid that form on the kidneys and are usually harmless. Most of them are so small they don't cause any symptoms and are known as simple kidney cysts. That said, if the cysts begin to grow, they can lead to symptoms, while still generally remaining noncancerous and of minor severity. While no one knows what causes kidney cysts, they usually do not require treatment and go away on their own. In some cases, however, the symptoms of kidney cysts can impair kidney function and may be indicative of a hereditary condition called polycystic kidney disease.
Flank pain arises at the side of your abdomen or back, between your ribs and pelvis. It is often described as a dull heaviness that tends to be persistent but can also cause shooting pains. The most common causes of flank pain are urinary tract infections, kidney stones, and muscle strains or pinched nerves. This can make it difficult to pinpoint the source of the symptom. However, if the flank pain is a result of kidney cysts, it will most likely feel like a dull ache.
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