Home Blogs Flank Pain: Causes, Symptoms, Diagnosis and When to Seek Care

Flank pain may be linked to kidney, urinary or muscle conditions.

By Dr. Philip Padmakar Nethagani

August 04, 2026

Flank Pain: Causes, Symptoms, Diagnosis and When to Seek Care

Q: Can gas cause flank pain?

Digestive conditions can sometimes cause pain towards the side, but gas should not be assumed when pain is severe, persistent or accompanied by urinary symptoms, fever or vomiting.

Q: Can dehydration cause flank pain?

Dehydration may increase the risk of concentrated urine and some kidney stones, but flank pain should not automatically be attributed to low water intake. Persistent pain requires evaluation.

Q: Does flank pain always mean a kidney stone?

No. Kidney infections, urinary obstruction, muscle strain, spinal problems and conditions involving nearby organs can also cause flank pain.

Q: Can a kidney infection occur without burning urination?

Yes. Some people mainly develop fever, chills, nausea or pain in the back or side. Urine tests and medical assessment may be needed.

Q: Is right-side flank pain different from left-side flank pain?

The side can help narrow the possibilities, but either kidney, surrounding muscles or nearby organs can cause pain. The pattern and associated symptoms are more important than the side alone.

Q: Can flank pain be muscular?

Yes. Pain after lifting, exercise, coughing or twisting that worsens with movement or pressure may be muscular. Severe or persistent pain should still be assessed.

Q: Which doctor should I consult for flank pain?

A general physician can begin the evaluation. A urologist may treat stones or urinary obstruction, and a nephrologist may manage medical kidney disease or reduced kidney function.

Q: What tests are commonly done for flank pain?

Urine tests, blood tests, ultrasound and CT imaging are commonly considered depending on symptoms, examination findings and the suspected cause.

Flank pain is discomfort felt on either side of the body between the lower ribs and upper hip, usually towards the side or back. It may arise from kidney stones, a kidney infection, urinary obstruction, muscle strain or another nearby organ. Severe, persistent pain or pain with fever, vomiting or urine changes needs medical assessment.

Need medical guidance? Consult a Renova physician, urologist or nephrologist if flank pain is severe, persistent or associated with urinary symptoms.

Key Takeaways

Kidney stones, kidney infections, urinary blockage and muscle strain are common causes of flank pain.
Pain that comes in waves and spreads towards the groin may occur with a kidney stone.
Flank pain with fever, chills, vomiting or painful urination may indicate a kidney infection.
Blood in the urine, inability to pass urine or sudden unbearable pain requires urgent evaluation.
The location of pain alone cannot confirm the cause; examination and tests may be needed.
Treatment should target the underlying condition rather than rely only on repeated pain relief.

When is flank pain an emergency? Seek urgent care for severe or rapidly worsening pain, high fever, shaking chills, repeated vomiting, blood in the urine, inability to urinate, fainting, confusion, pregnancy, a single functioning kidney, or a cold and very weak patient. Visit Emergency Medicine at Renova Hospitals or call 040 2333 3333.

Where Is the Flank Located?

The flank is the area on the side of the body between the lowest ribs and the pelvis. Pain may occur on the right, left or both sides. It may stay in one spot or spread towards the abdomen, groin, hip or lower back. Because the kidneys lie towards the back under the ribs, kidney pain is often felt deeper than surface muscle pain, but symptoms can overlap.

What Are the Common Causes of Flank Pain?

Can Kidney Stones Cause Flank Pain?

Yes. Kidney stones can cause sharp pain in the back or side that may move towards the lower abdomen or groin. The pain may come in waves as the urinary tract contracts around the stone. Nausea, vomiting, frequent urination, painful urination or blood in the urine may also occur.

Patients with suspected stones may need evaluation by a urologist at Renova Hospitals, especially when pain is severe, urine flow is reduced or blood is visible in the urine.

Can a Kidney Infection Cause Flank Pain?

A kidney infection can cause pain in the back, side or groin together with fever, chills, painful or frequent urination, cloudy or foul-smelling urine, nausea or vomiting. Kidney infections need timely medical treatment because infection can spread to the bloodstream or damage the kidney.

Can Urinary Blockage Cause Pain in the Side?

A stone, narrowing, enlarged prostate or another blockage can interfere with urine flow and produce flank pain. Some people also notice reduced urine output, urinary urgency, swelling or repeated urinary infections. Obstruction with infection can become an emergency and may require a procedure to drain the urinary tract.

Can Muscle Strain or Back Injury Cause Flank Pain?

Yes. Strained muscles around the back, ribs or abdomen may cause flank discomfort after lifting, exercise, coughing, twisting or an awkward movement. Muscular pain often worsens with movement, deep breathing or pressure over the affected area and may improve with rest. Persistent or severe pain still requires assessment because kidney and muscle pain can feel similar.

What Other Conditions Can Cause Flank Pain?

Spinal disc, joint or nerve problems
Shingles, especially when burning pain is followed by a rash
Gallbladder, liver, bowel or pancreatic conditions
Lung or chest-wall problems
Kidney cysts or less common kidney disorders
Trauma involving the ribs, abdomen or urinary tract

Because several organs are close to the flank, the cause should be evaluated rather than assuming every pain in this area is a kidney problem.

How Can You Tell Kidney Pain From Muscle Pain?

Kidney-related pain is often felt deeper under the ribs and may occur with urine changes, fever, nausea or pain moving towards the groin. Muscle pain is more likely to follow lifting or unusual movement and may be tender when pressed. These patterns are useful clues but are not reliable enough to make a diagnosis without an examination.

What Symptoms May Occur With Flank Pain?

Fever or chills
Burning or pain while urinating
Frequent or urgent urination
Blood, cloudiness or unusual smell in the urine
Nausea or vomiting
Pain spreading to the abdomen or groin
Tenderness or pain with movement
Reduced urine output
A new rash or numbness

How Is Flank Pain Diagnosed?

The doctor will ask when the pain started, whether it is constant or comes in waves, where it spreads and whether urinary, digestive, respiratory or movement-related symptoms are present. The abdomen, back and flank may be examined for tenderness, swelling or muscle spasm.

Depending on the suspected cause, tests may include:

Urine analysis to look for infection, crystals or blood
Blood tests to assess infection, kidney function and dehydration
Ultrasound of the kidneys and urinary tract
CT imaging when a stone, obstruction or another internal cause is suspected
Other imaging or specialist tests based on the examination

What can a doctor check? A General Medicine physician may begin the assessment and coordinate urine tests or imaging. A urologist may manage stones or urinary obstruction, while a nephrologist may assess kidney-function problems or medical kidney disease.

How Is Flank Pain Treated?

Treatment depends on the cause. A kidney infection generally requires prescribed antibiotics. Kidney stones may be managed with clinician-approved pain relief, hydration guidance and medicines in selected cases, while larger or obstructing stones may require a procedure. Muscle strain may improve with activity modification, physiotherapy and pain relief that is safe for the individual patient.

Do not repeatedly self-medicate with antibiotics or strong painkillers without a diagnosis. Some pain medicines may be unsafe for people with kidney disease, stomach ulcers, heart disease, pregnancy or other conditions.

What Can You Do at Home While Waiting for Evaluation?

Rest from strenuous activity if a muscle injury is possible.
Drink fluids normally unless a doctor has restricted your intake.
Monitor temperature and urine for blood, cloudiness or reduced output.
Use only pain medicines that are safe for you and recommended by a healthcare professional.
Do not delay care if pain is severe, worsening or accompanied by fever or vomiting.

When Should You Consult a Doctor?

Pain lasts more than a few hours or keeps returning
Pain interferes with sleep or routine activity
There is burning urination, urgency or urine colour change
Fever, chills, nausea or vomiting develops
You have kidney disease, a single kidney or are pregnant
Home treatment is not improving the pain

Get the cause evaluated Book a General Medicine consultation, explore Renova Urology services or request a callback.

Consult a Physician, Urologist or Nephrologist at Renova Hospitals

Consult General Medicine, Urology or Nephrology at Renova Hospitals for persistent or recurrent flank pain. For appointments, request a callback or call 040 2333 3333.

Medical References

Medically Reviewed & Approved By:

Dr. Philip Padmakar Nethagani

Urology, Kidney Transplantation, Robotic Surgery & Pediatric Urology
MBBS, MS (General Surgery), MCh (Urology), DNB (Urology)

This article has been reviewed and approved by a qualified medical professional to ensure accuracy, credibility, and adherence to current clinical standards.

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Urology, Kidney Transplant, Robotic Surgery

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