Kidney stones during pregnancy can cause sudden pain in the side or back, nausea, and changes in urination. These symptoms need prompt assessment because a urinary infection, an obstructed kidney, and some pregnancy complications can feel similar. The good news is that many stones can be managed with careful monitoring, while specialist procedures are available when needed.
Quick answer: Ultrasound is usually the first imaging test for suspected kidney stones in pregnancy. Treatment depends on symptoms, infection risk, kidney function, gestational age, and whether urine flow is blocked. Contact your maternity care team promptly for new flank pain; seek emergency care for fever, severe pain, inability to urinate, persistent vomiting, or obstetric warning signs.
Table of Contents
What Are Kidney Stones During Pregnancy?
Kidney stones are mineral deposits that form in the urinary tract. Pregnancy changes urinary drainage and urine chemistry, but these changes do not mean every pregnant person will develop stones. A stone may remain in the kidney without symptoms or enter a ureter and cause renal colic.
Pain is not enough to confirm a stone. Your clinician may need to rule out urinary tract infection, appendicitis, and pregnancy-related causes of abdominal or back pain.
Symptoms and Warning Signs
Common symptoms
- Pain in the side or back, sometimes radiating toward the groin
- Blood in the urine, which may only be detectable on testing
- Nausea or vomiting during painful episodes
- Burning, urgency, or frequent urination, which can also suggest a urinary infection
When to seek urgent help
Seek emergency assessment for fever or chills, severe or persistent pain, inability to pass urine, repeated vomiting or dehydration, or feeling seriously unwell. Contact maternity emergency services immediately for vaginal bleeding, fluid leakage, contractions, reduced fetal movement when applicable, or other pregnancy concerns. An infected, obstructed kidney is an emergency.
Why Stones May Occur in Pregnancy
Pregnancy-related hormonal and anatomical changes can dilate the urinary collecting system. Calcium excretion and other urine constituents also change, with some protective changes occurring at the same time. Dehydration and a previous history of stones may contribute to risk; pregnancy itself does not make stones inevitable.
Factors your care team considers
- Previous kidney stones or family history
- Fluid intake and vomiting-related dehydration
- Urinary infections or urinary tract abnormalities
- Dietary sodium and relevant metabolic conditions
How Kidney Stones Are Diagnosed Safely
Urine and blood tests
Clinicians may check a urine sample for blood and infection, send a urine culture, and assess kidney function or other blood results as needed. Pregnancy-related urinary tract infections require prompt assessment.
Ultrasound is usually first
Renal and bladder ultrasound is generally the first-line imaging choice because it uses no ionizing radiation. However, pregnancy can cause normal urinary tract dilation, and ultrasound may not always identify a stone.
If ultrasound is inconclusive
A specialist may consider MRI without contrast or, when medically necessary, a carefully selected low-dose CT scan. Imaging decisions balance the risks of delayed diagnosis against the risks of each test; necessary imaging should not be withheld automatically.
Treatment Options for Kidney Stones During Pregnancy
Monitoring and supportive care
When pain is controlled, there is no infection or concerning obstruction, and the patient is clinically stable, the care team may recommend observation, appropriate fluids, pregnancy-compatible pain treatment, and follow-up. Some stones pass without a procedure, but passage is not guaranteed.
Pain medicines and fluids
Only use medicines approved by your obstetric or treating clinician. Nonsteroidal anti-inflammatory drugs (NSAIDs), including ibuprofen, have important pregnancy-related restrictions, particularly from 20 weeks onward. Do not start stone-expulsion medicines, herbal mixtures, or high-dose supplements without medical advice. Drink normally according to your pregnancy care plan; forcing large amounts of water does not reliably dislodge a stone.
Procedures when needed
An infected obstructed kidney needs urgent drainage, often with a ureteral stent or nephrostomy tube, plus appropriate treatment of infection. For selected patients, ureteroscopy may be offered by an experienced urology and obstetric team. Shock-wave lithotripsy is not used during pregnancy.
| Approach | When it may be used | Key consideration |
|---|---|---|
| Observation | Stable patient, manageable symptoms | Follow-up is essential |
| Ureteral stent or nephrostomy | Urgent drainage for infection or obstruction | May require later exchange or definitive treatment |
| Ureteroscopy | Selected stones requiring treatment | Specialist planning during pregnancy |
Can Kidney Stones Affect the Baby or Cause Miscarriage?
A kidney stone does not automatically harm the baby or cause miscarriage. However, stone episodes complicated by infection, dehydration, or obstruction can pose risks to the pregnant patient and pregnancy. Research has reported associations with adverse pregnancy outcomes, but that does not mean a stone will cause those outcomes in an individual case. Timely obstetric and urologic assessment matters.
Can You Pass a Kidney Stone Naturally While Pregnant?
Some small stones pass on their own under medical supervision. There is no proven exercise, jumping routine, yoga pose, or home drink that reliably makes a stone pass safely during pregnancy. Gentle normal activity may be acceptable if your maternity team agrees, but do not use vigorous movement to try to force a stone out.
For general information about stone prevention, see water and kidney stones. Pregnancy-specific fluid recommendations should come from your care team.
Preventing Kidney Stones During Pregnancy
- Stay hydrated according to your prenatal care advice, particularly if vomiting or exposed to heat.
- Limit excess salt and follow a balanced pregnancy diet; do not eliminate calcium-rich foods without clinical advice.
- Attend prenatal appointments and discuss any history of stones or recurrent urinary infections.
- Avoid unapproved herbal stone remedies and high-dose vitamin or mineral supplements.
Frequently Asked Questions
Is ultrasound safe for kidney stone diagnosis during pregnancy?
Yes. Ultrasound does not use ionizing radiation and is generally the first imaging test for suspected stones in pregnancy.
What are the first signs of kidney stones during pregnancy?
Flank or back pain, nausea, urinary discomfort, or blood in urine can occur. These symptoms overlap with other conditions, so assessment is important.
Can I take ibuprofen for kidney stone pain while pregnant?
Do not take ibuprofen or other NSAIDs for stone pain unless your pregnancy clinician specifically directs you to. The risks vary with gestational age.
How long does it take to pass a stone?
There is no reliable timetable. Passage depends on stone size and location, symptoms, and complications; follow-up is important even if pain improves.
When should I go to the hospital?
Seek urgent care for fever, chills, severe pain, vomiting, low urine output, or any concerning pregnancy symptoms.
Key Takeaways
- New flank pain during pregnancy deserves prompt medical assessment.
- Ultrasound is usually the first diagnostic imaging test.
- Some stones can be monitored; infection or significant obstruction may require urgent intervention.
- Avoid self-prescribed pain medicines, herbal remedies, and exercises intended to force stone passage.
Author and Medical Disclaimer
Author: Yamanandan Reddy, Health Content Writer. This article provides educational information and does not claim individual physician review.
Medical disclaimer: This content is not a diagnosis or a substitute for your obstetrician or urologist. If you are pregnant and experiencing possible kidney stone symptoms, contact your maternity care team promptly.
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