question: Hello Im 11, A female i have been having a sore kidney on my sleft side for a while and it really hurts and it may be a infection? I have had a unrine sample done but nothing showed up but that doesnt mean i dont have a infection? Sometimes i cant walk for 2 days without crying. My sister has had them for 6 years but shes only my half sister could it run in the family? they dont no whats wrong with her yet?