24/7 Emergency Care. Our patients are first.
Flank pain often begins as a deep ache or sharp pain along one side beneath the lower ribs. It may stay in one place, come in waves, or move toward the lower abdomen or groin. What matters most is not whether you can name the cause. It is how the pain began, what has changed, and whether your body is still working normally.
Notice How the Pain Is Behaving
Some flank pain stays mild and settles. More concerning pain becomes stronger, returns in waves, remains constant, or makes it hard to sit still, walk normally, sleep, drink, or focus on anything else. You may also notice that the pain now comes with chills, repeated vomiting, blood in the urine, or a change in how much you can urinate.
Pain can be difficult to describe. Start with what happened first, where you feel it now, and what you can no longer do comfortably. Those details are useful.
Call 911 When Flank Pain Makes Private Travel Unsafe
Call 911 instead of driving when flank or kidney pain is accompanied by signs that you may be seriously unstable, including:
Fainting, collapse, or being difficult to wake.
New confusion or unusual inability to respond normally.
Severe trouble breathing, a very fast weak pulse, or pale, cool, clammy skin.
Severe flank pain after a major collision, fall, or forceful blow, especially with marked weakness or decreasing alertness.
These changes matter because the concern is no longer the pain alone. Emergency medical services can begin assessment during transport and help you travel more safely. Do not drive yourself when you feel faint, confused, severely weak, or unable to remain safely alert.
Come to the ER When Flank or Kidney Pain Should Not Wait
Come to the ER for prompt evaluation when you notice one or more of these patterns:
The pain is sudden, severe, rapidly worsening, or so intense that you cannot get comfortable.
The pain comes in strong waves or moves from the side toward the lower abdomen or groin.
You have fever, shaking chills, or feel markedly weaker and sicker as the pain continues.
You are vomiting repeatedly or cannot keep fluids or needed medication down.
Your urine looks pink, red, or brown, contains clots, or the amount of blood is increasing.
You cannot urinate, produce only a very small amount, or notice a clear drop from what is normal for you.
The pain began after a significant blow, fall, or collision, particularly when urine output changes or blood appears in the urine.
You are pregnant, have one working kidney, or have a kidney transplant and the pain is new, severe, or joined by fever, vomiting, blood in the urine, or reduced urination.
You do not need every warning sign on this list. A meaningful change in the pain, urine, hydration, or your ability to function may be enough to make emergency evaluation the safer next step.
When Mild and Stable Symptoms May Start Elsewhere
Urgent care may be a reasonable place to start when the discomfort is mild, stable, not worsening, and you can walk, drink, and urinate normally. There should be no fever, shaking chills, repeated vomiting, visible blood in the urine, major injury, pregnancy-related concern, or high-risk kidney history.
The important word is stable. If the pain becomes stronger, starts coming in waves, limits normal activity, or is joined by any warning change above, come to the ER.
Describe What You Feel Without Trying to Diagnose It
Flank and kidney pain can feel different from one person to another. You may notice:
A deep, steady ache beneath the lower ribs on one side.
Sharp pain that builds and eases in waves.
Pain that travels toward the lower abdomen or groin.
Tenderness in the side that makes movement or lying down uncomfortable.
Side pain followed by a noticeable change in urine color or amount.
Tell the physician whether the pain began suddenly or gradually, whether it moves, and whether anything makes it better or worse. Also mention fever, chills, vomiting, urinary changes, pregnancy, a recent injury, previous stones, a kidney transplant, or having only one working kidney. You do not need perfect medical words. A clear timeline is enough to begin.
Why Certain Combinations Need Faster Evaluation
Severe flank pain by itself may require prompt pain control and testing. When it is joined by fever or shaking chills, the concern changes because infection may be affecting more than the lower urinary tract. When vomiting prevents you from drinking, fluid loss can build while the original problem remains untreated. When urine will not pass, the physician must consider whether normal urine flow is blocked.
Visible blood also deserves attention when it appears with significant flank pain. A small color change may still be important, and clots can make urination more difficult. The pattern matters more than any one symptom in isolation.
How the Emergency Physician Evaluates Flank and Kidney Pain
At Post Oak ER, the first step is listening to how the pain started and examining what has changed. The emergency physician may check your temperature, blood pressure, hydration, and areas of tenderness. You may be asked about urine color and amount, fever, vomiting, pregnancy, recent injury, previous stones, current medications, and kidney history.
A urine test may help show blood or signs of infection. Blood testing may help the physician assess kidney function, fluid balance, and whether infection is affecting the body more broadly. Depending on your symptoms and examination, CT or ultrasound may help look for a stone, blocked urine flow, injury, or another urgent cause. Testing is selected for the question raised by your symptoms; not everyone needs every test.
Treatment may begin with medication for pain or nausea, IV fluids when you cannot hydrate adequately, or antibiotics when infection is a concern. If the evaluation suggests a serious blockage, widespread infection, major injury, or a need for inpatient or surgical care, Post Oak ER can begin stabilization and arrange transfer to an appropriate hospital.
24/7 Flank and Kidney Pain Care Near The Galleria
Post Oak ER is open 24 hours a day at 5018 San Felipe Street, Houston, TX 77056, near The Galleria and I-610. Adults and children may walk in without an appointment. We serve people from Uptown, Tanglewood, River Oaks, Briargrove, Briarcroft, Highland Village, and the greater Galleria area.
Call 911 when flank pain comes with collapse, new confusion, severe breathing trouble, or another change that makes private transport unsafe.
Whether you’re in Westchase, Midtown, or the Heights, getting to Post Oak ER is simple. We’re centrally located near major Houston routes like I‑610 and San Felipe — just a short drive from Memorial Park and River Oaks. Many patients reach us via Westheimer or Woodway Dr., depending on their neighborhood.
We accept most major insurance plans and also welcome self-pay patients with transparent, upfront pricing. Many Memorial-area patients visit us using Blue Cross, Aetna, Cigna, Humana, Molina, and United Healthcare.
Yes. We’re open 24 hours a day, 7 days a week. Our freestanding ER model is designed to minimize or eliminate wait times so you’re seen fast.
No. Walk in anytime. If it’s an emergency, come straight in or call ahead and we’ll be ready: 832-581-2277.
5018 San Felipe St, Houston, TX 77056 — near The Galleria/Uptown. Free, convenient parking right by the entrance.
Yes. Our board-certified emergency physicians care for all ages, including pediatric emergencies.
Chest pain, shortness of breath, severe headache/migraine, abdominal pain, injuries and fractures, cuts requiring stitches, high fever, dehydration, allergic reactions, asthma attacks, and more. If you believe it’s life-threatening, call 911.
Yes. We offer on-site CT scans, digital X-rays, and a full laboratory, so most tests and results are done during your visit.
Absolutely. We routinely see patients from Uptown, The Galleria, River Oaks, Tanglewood, and Memorial.
A photo ID, insurance card (if available), a list of medications/allergies, and any recent medical records you have.
We accept most major private insurance plans. Coverage varies by plan; our team will help verify benefits and discuss any out-of-pocket costs. Questions? Call 832-581-2277.
Urgent care handles minor illnesses/injuries. ERs have advanced imaging, lab, medications, and emergency physicians for time-sensitive or severe conditions (e.g., chest pain, severe abdominal pain, serious injury, difficulty breathing).
Yes. If inpatient care or surgery is required, we coordinate a direct transfer to the appropriate hospital.
Times vary by condition and testing, but our no-wait intake and on-site diagnostics help you get answers and treatment as quickly as possible.