Why do kidney stones happen alongside PKD at 38?

Question

Hello doctor,

I am a 38-year-old male with polycystic kidney disease (PKD), and over the last year I have had two kidney stones in addition to the cyst-related kidney issues. Honestly, I initially thought the flank pain was simply part of the PKD until I ended up in the emergency room and a CT scan showed kidney stones as well.

My nephrologist mentioned that kidney stones can occur more frequently in people with PKD, but I still do not fully understand why. I already try to stay well hydrated, but between the cyst pain and the stones, it feels like my kidneys are constantly under stress.

For people with PKD, why do kidney stones seem to happen so often alongside the cysts?
Is there anything besides drinking more water that can actually help lower the risk?

Please help.

Thank you.

Answer 1

Hello,

Welcome to icliniq.com.

I have gone through your query and understand your concern.

Kidney stones are unfortunately more common in people with polycystic kidney disease (PKD), so your experience is not unusual. In PKD, the enlarged cystic kidneys can alter the normal drainage of urine, causing urine to stagnate more easily, which increases the risk of stone formation.

Many people with PKD also develop changes in urine chemistry, such as low citrate levels or more acidic urine, both of which can promote kidney stones. Because flank pain is already common in PKD, stones are sometimes initially mistaken for cyst-related pain until imaging confirms them, exactly as happened in your case.

Hydration is important, but it is not the complete answer. Depending on the type of stone and the results of urine analysis, other measures may help significantly. These can include:

Reducing excess salt intake.
Moderating animal protein consumption.
Increasing citrate intake. In some cases, potassium citrate may be prescribed.
Identifying specific metabolic abnormalities through a 24-hour urine study.

The key point is that kidney stone prevention in PKD should be individualized rather than based only on drinking more water. Once the stone composition and urine chemistry are understood, prevention strategies can become much more targeted and effective.

I hope I have answered your question.

Let me know if I can assist you further.

Thank you.