I have a had a kidney cyst since 2009. It has been growing since and is now very large, 16cm. I have been told that it is ok unless causing symptoms. Is this the case being this large? This week it started giving me symptoms. I have a feeling of pressure fullness and ache (not very painful) on the affected side and my back. It is uncomfortable. All my vitals are ok. Blood pressure is ok. I have no urinary symptoms. I have seen my PCP last night. She is referring me to a kidney specialist. Until then, I am concerned about rupture. What steps would I need to take if it happens? What would rupture be like, what to expect if that happened? How painful is rupture? Would it require calling 911? I feel best when resting lying down. The uncomfortable symptoms began in the past two days. I am trying to get advice until I get to the specialist. Thank you in advance.