Urgent Care for Kidney Stones: When to Walk In vs. Go to the ER

Kidney stone pain hits fast. One minute you feel fine. The next you have a stabbing pain in your back or side that will not let up. If you think you are passing a kidney stone, you need to act quickly. Urgent care for kidney stones is the right choice in many situations. For example, when the pain is manageable and you have no fever, urgent care handles the workup and treatment. However, some cases need the ER right away. This guide explains the difference so you know where to go.

Medically reviewed by Sean Parkin, PA — CEO & Founder, CityHealth Urgent Care

What CityHealth Can Do for Kidney Stones

CityHealth urgent care in San Leandro offers several services for kidney stone patients. For example, we manage pain, run tests, and set up the follow-up care you need.

Specifically, we can help with:

• Pain management — anti-inflammatory medication for fast relief. These drugs also reduce muscle spasms in the ureter, because that is often the main source of pain.
• Anti-nausea medicine — because kidney stone pain often causes vomiting
• Urine test — checking for blood in the urine, which is present in most stone cases, and ruling out infection
• Blood work — checking kidney function and mineral levels
• CT scan referral — to confirm the stone and measure its size
• Tamsulosin prescription — a pill that relaxes the ureter, therefore helping small stones pass more easily
• Urology referral — for stones that need a procedure to remove

Because urgent care handles the initial evaluation and pain control, many patients avoid a long ER wait. However, this only applies when symptoms are manageable and there is no sign of infection.

What Do Kidney Stones Feel Like?

Kidney stone pain is intense. In fact, many patients say it is the worst pain they have ever felt. It often comes in waves. Classic signs include:

• Sudden, sharp pain in your back or side — below the ribs, usually one side
• Pain that comes and goes as the stone moves
• Pain moving down to the groin or lower belly
• Blood in the urine — pink, red, or brown
• Nausea or vomiting
• Frequent urge to urinate
• Burning near the bladder when the stone is close to passing
• Difficulty getting comfortable — you may pace or shift positions constantly

Small stones — under 5mm — pass on their own most of the time. However, larger stones may need a procedure. Because stone size matters for the treatment plan, imaging helps confirm what you are dealing with.

When to Go Directly to the ER

Fever plus kidney stone symptoms is the red flag. Because that combination can mean an infected, blocked kidney, it is an emergency. Do not go to urgent care in this case. Call 911 or go to the ER.

Go to the ER if you have:

• Fever above 100.4°F with kidney stone symptoms — this is an emergency
• Pain you cannot manage — 9-10 out of 10, constant, nothing helps
• Only one working kidney — because a blockage threatens your only kidney
• A known large stone (over 10mm) — these rarely pass on their own
• Unable to urinate at all — complete blockage is a medical emergency

In other words, any fever changes the plan. If pain is severe but there is no fever and you can keep fluids down, urgent care is a good first step.

Urgent Care for Kidney Stones vs. ER: Quick Guide

Come to urgent care if:

• Pain is a 5 out of 10 or less
• No fever
• You can keep fluids down
• You have had kidney stones before and know the pattern
• You need a urine test, pain medicine, and a CT scan referral

Go to the ER if:

• Fever above 100.4°F
• Pain is 9-10 out of 10 and not getting better
• You are vomiting and cannot stop
• You cannot urinate at all
• You have one kidney or kidney disease

Can Urgent Care Diagnose Kidney Stones Without a CT Scan?

Yes, to a point. Because blood in the urine combined with classic flank pain strongly suggests a stone, urgent care can make a probable diagnosis from the urine test and your history alone. However, a CT scan confirms the size and location of the stone. That information drives the treatment plan.

CityHealth can order a CT referral at your visit. For example, we send the imaging order while you are still here, so you go directly to the radiology center afterward. Learn more about CT scans ordered at urgent care. However, if imaging is needed right now due to severe pain, the ER has CT available around the clock.

What to Do After the Visit

If you are sent home to pass the stone, here is the plan. Because most small stones pass within a few days to a few weeks, home management is the standard approach for mild cases.

Drink water: Aim for 2-3 liters a day. Because fluids help flush the stone, this is the most important thing you can do. However, avoid alcohol and too much caffeine — both dehydrate you.

Take tamsulosin: This pill relaxes the muscle in the ureter. Because of this, it helps stones pass faster. It works best for smaller stones in the lower ureter.

Use pain medicine: Anti-inflammatory drugs like ibuprofen are preferred for kidney stone pain. Because they also reduce spasms, they work better than other pain medications for this condition.

Strain your urine: Your provider may give you a small strainer. Because the stone’s makeup tells you why it formed, catching it helps prevent future stones.

Follow up: See a urologist within a week if the stone has not passed. In addition, if this is your first kidney stone, a follow-up visit helps prevent the next one.

According to the National Institute of Diabetes and Digestive and Kidney Diseases, about 11% of men and 6% of women will have a kidney stone at some point. Because the recurrence rate is high, follow-up care matters a lot.

Kidney Stone FAQ

How long does it take to pass a kidney stone? Small stones — under 4mm — often pass within 1-2 weeks. However, stones between 4-6mm can take 2-4 weeks. Because every case is different, your provider gives you a more specific estimate based on imaging.

What foods cause kidney stones? High-sodium and high-protein diets are common culprits. In addition, certain foods — like spinach, nuts, and beets — are high in oxalate, which forms one of the most common stone types. However, your stone’s makeup tells you exactly which foods to limit. That is why catching the stone and having it analyzed is so helpful.

Can dehydration cause kidney stones? Yes. Because concentrated urine allows minerals to crystallize, not drinking enough water is one of the top causes of stone formation. In fact, staying well-hydrated is the single best way to prevent future stones.

Walk In for Kidney Stone Care — No Appointment Needed

If you have kidney stone symptoms without a fever and the pain is manageable, CityHealth urgent care in San Leandro is the right place to start. Because we run same-day urine tests and blood work, order CT referrals, and prescribe pain medicine and tamsulosin, you leave with a clear plan.

In addition, we manage other causes of belly and back pain. See our guide to urgent care for abdominal pain if you are not sure what is causing your symptoms.

Walk in or book a same-day appointment at CityHealth San Leandro. Most insurance accepted, including Medi-Cal and Alameda Alliance. No referral needed.