Kidney pain is also caused due to pyelonephritis or kidney infection. Pain occurs due to infection and inflammation of the capsule that surrounds the kidney. Unlike back pain, both these types of kidney pain are accompanied with fever, nausea and vomiting. Other potential causes of kidney pain include cancer and bleeding inside the kidneys due to injury. Dull aching pain in kidney can be caused due to polycystic kidney disease or gradual blockage of urine flow.
Sustain is defined as to support something or to endure a trial or hardship. 1  An example of sustain is for a foundation to support the house. 2  An example of sustain is to survive days without food or water.
Support, maintain, sustain, uphold all mean to hold up and to preserve. To support is to hold up or add strength to, literally or figuratively: The columns support the roof. To maintain is to support so as to preserve intact: to maintain an attitude of defiance. To sustain, a rather elevated word, suggests completeness and adequacy in supporting: The court sustained his claim.