Kidney stone symptoms during pregnancy can be worrying, especially when you are unsure which tests or treatments are suitable. Pregnancy changes how doctors investigate pain and choose treatment, but it does not mean necessary care must wait until after delivery.
The priority is to check for infection, blocked urine flow, and pregnancy-related causes of pain. Your maternity team and urologist may work together to decide whether monitoring, medication, or a procedure is appropriate.
When to Get Urgent Medical Help
Contact your maternity team or seek urgent medical assessment if you have side or back pain with:
- Fever, chills, or feeling unusually unwell.
- Persistent vomiting or difficulty keeping fluids down.
- Severe pain that is not controlled.
- Very little urine or difficulty passing urine.
- Burning urination, particularly with fever or back pain.
A kidney infection during pregnancy may require hospital treatment. Confusion, marked drowsiness, or collapse warrants emergency help.
Do not assume abdominal pain is a kidney stone because you have had stones before. Vaginal bleeding, leaking fluid, or regular painful contractions need prompt maternity assessment.
If your baby’s usual movements slow down, stop, or change, contact your maternity unit immediately rather than waiting until the next day.
How Are Kidney Stones Assessed During Pregnancy?
Assessment usually includes a discussion of your symptoms, previous stones, medicines, and pregnancy history. Clinicians may check:
- Your temperature, blood pressure, and hydration.
- A urine sample for blood and signs of infection.
- A urine culture to identify bacteria.
- Blood tests, including kidney function and blood count.
- Your baby’s wellbeing, with assessment appropriate to the stage of pregnancy.
These checks help establish whether observation is reasonable or urgent treatment is needed. Symptoms alone cannot confirm a stone or determine its composition.
For background on the usual investigations, see our guide to kidney stone diagnosis and tests. Pregnancy requires additional considerations when choosing imaging.
Which Scans Can Be Used During Pregnancy?
Ultrasound Usually Comes First
Ultrasound is generally the first scan for suspected stones during pregnancy. It avoids ionizing radiation and can assess the kidneys and urinary tract.
However, normal pregnancy-related widening of the urinary drainage system can resemble obstruction. An unclear ultrasound does not settle the diagnosis, and further imaging may be necessary.
Further Imaging Depends on the Clinical Situation
| Scan | Why it may be considered | Main consideration |
|---|---|---|
| Ultrasound | Initial assessment of the kidneys and urinary tract | May not provide a definite explanation for symptoms |
| MRI | Additional assessment when ultrasound is inconclusive | Avoids ionizing radiation; usefulness depends on the clinical question |
| CT | Clarifying an important diagnosis when other tests are insufficient | Uses radiation, so clinicians weigh the benefit against the exposure |
A necessary CT scan is not automatically ruled out during pregnancy. The American College of Obstetricians and Gynecologists advises that clinically necessary imaging should not be withheld simply because someone is pregnant.
The team should explain why the scan is needed and whether another test can provide the answer promptly.
Questions you can ask include:
- What uncertainty will this scan resolve?
- Could the result change my treatment today?
- Is another suitable test available?
- How will exposure be minimized if CT is necessary?
Can a Kidney Stone Pass Without a Procedure?
Observation may be appropriate for an uncomplicated stone when symptoms are manageable and there is no reason for urgent intervention. This means a clinician-supervised plan with follow-up.
Supportive care may include prescribed pain relief, treatment for nausea, and fluids appropriate to your condition. Before going home, ask what symptoms should bring you back and when reassessment will happen.
General kidney stone passage timelines should not be used to decide how long it is safe to wait during pregnancy. Your individual findings and maternity assessment matter.
Which Medicines May Be Used?
Pain Relief Needs a Pregnancy-Specific Plan
Your clinician may recommend acetaminophen, also called paracetamol. Use the advised dose and duration, and check combination products to avoid accidentally taking the same ingredient twice.
Severe pain may require stronger prescription treatment. The choice should account for your pregnancy, other medicines, and medical history.
Do Not Self-Treat With Ibuprofen or Similar Medicines
NSAIDs include ibuprofen, naproxen, and diclofenac. The FDA advises avoiding them from 20 weeks of pregnancy onward unless specifically directed by a healthcare professional, because they can affect fetal kidney function and reduce amniotic fluid. Additional risks apply later in pregnancy.
This does not mean they are automatically suitable earlier in pregnancy—check before taking them.
Prescribed low-dose aspirin is a separate situation. Do not stop aspirin prescribed for a pregnancy-related reason without speaking to your maternity team.
Tamsulosin Is Not a Routine Self-Treatment Option
Tamsulosin is sometimes prescribed to help selected patients pass ureteral stones, but pregnancy requires a separate assessment. The NHS states that it is not usually recommended during pregnancy because there is insufficient safety information.
Do not take leftover tamsulosin from an earlier stone episode. If you already take it, discuss it with your prescriber.
Infection Needs Prompt Treatment
A suspected kidney infection requires urgent assessment, and pregnant patients may need hospital admission and intravenous antibiotics. The treatment plan will depend on the infection and your clinical condition.
When Is a Procedure Needed?
A procedure may be necessary when symptoms remain uncontrolled, obstruction causes complications, or conservative care fails.
An infected, obstructed urinary system requires urgent drainage. Treatment should not be delayed simply to reach a different trimester.
Options include:
| Procedure | Purpose |
|---|---|
| Ureteral stent | An internal tube that allows urine to drain past an obstruction |
| Nephrostomy | A drainage tube placed into the kidney through the back |
| Ureteroscopy | A scope-based procedure that can treat or remove a stone |
Ureteroscopy can be an alternative to continued drainage in selected patients. When treatment is nonurgent, the second trimester is generally preferred, with an experienced team and obstetric support.
Shock wave lithotripsy is contraindicated during pregnancy. It is different from laser treatment performed during ureteroscopy.
You can read more about the role of drainage in our ureteral stent guide.
Follow-Up Matters After Treatment
Stents can develop mineral deposits more quickly during pregnancy, making planned monitoring and exchanges particularly important.
Before leaving hospital, ask for a clear written plan covering:
- Your next urology and maternity appointments.
- Which medicines to take and for how long.
- Whether further imaging is planned.
- The removal or exchange date for any drainage tube.
- Who to contact if symptoms return.
Keep these details with your maternity records so that each team can see the plan.
Are Home Remedies or “Stone-Breaker” Supplements Suitable?
Do not assume that a product is pregnancy-safe because it is described as natural. Herbal remedies and supplements may have uncertain ingredients or insufficient pregnancy safety information.
Check with your maternity team or pharmacist before using any stone supplement, herbal tea, or remedy. Do not stop prescribed medicines or replace antenatal care with a home treatment.
Bring the product packaging or ingredient list to your appointment if you have already used something.
Frequently Asked Questions
Can Treatment Wait Until After Delivery?
Sometimes ongoing observation is appropriate, but the decision depends on symptoms, infection, obstruction, and maternal and fetal wellbeing. Pregnancy alone is not a reason to postpone necessary treatment.
Is Every Episode of Side Pain a Kidney Stone?
No. Pregnancy-related abdominal pain has several possible causes. Severe or persistent pain, especially with bleeding or other concerning symptoms, needs assessment rather than a presumed stone diagnosis.
Does Needing a CT Scan Mean My Baby Will Be Harmed?
Not necessarily. The decision depends on the examination, expected exposure, and benefit of obtaining a diagnosis. Ask your radiology and maternity teams to explain the individual balance of benefits and risks.
What Should I Tell the Clinician?
Tell them how many weeks pregnant you are, when the pain began, whether you have fever or vomiting, and whether urination has changed.
Mention previous stones, kidney problems, allergies, and everything you take—including nonprescription medicines and supplements.
Resources
- European Association of Urology: Urolithiasis guidelines
- ACOG: Diagnostic imaging during pregnancy
- Management of Nephrolithiasis in Pregnancy: Multidisciplinary Guidelines
- FDA: NSAID use at 20 weeks of pregnancy or later
- Cambridge University Hospitals: Pain relief during pregnancy and after birth
- NHS: Tamsulosin during pregnancy
- NHS: Kidney infection
- NHS: Medicines in pregnancy
- NHS: Your baby’s movements
Medical disclaimer: This article provides general information and does not replace individual advice from your maternity team or urologist. Seek prompt assessment for suspected kidney stone symptoms during pregnancy.