<s>[INST] HI Im Roberto Dela Pena of Philippines,My problem is i have a small left kidney,it was found during my first medical test which KUB is mandatory,the doctor found out that my left kidney is small it was 2007 ago,can you explain me about this situation because everytime when i conduct a medical exam for work abroad they always found thesame result small left kidney,but i did not experience any trouble in my left side body part,can you explain me about this one,here is my e-mail add: robertodela  YYYY@YYYY , Thank very much,more power to all of you.. [/INST] Hi Thanks for your query. Uni-lateral small kidney is usually acquired after a disease affecting it. In your case, you may correlate with your past medical history. In such a case the other kidney enlarges to compensate for the function. Thus, the person has no problems from it. Sometimes it is present since birth. Then it is called as congenital hyperplasia. The pelvocalyceal system is small and usually pacified in intravenous biography. Again compensatory hypertrophy of the contralateral kidney happens. Associated anomalies of kidney are present.  You may watch for symptoms of urinary tract infection and other kidney disorders as it may affect the function of the other kidney.  Take care.  Chat Doctor.  </s>