October 2026

Back Pain or Kidney Pain? Location and Symptoms That Help Tell

By Your Health Magazine Health Information Team

Back pain is more likely to come from muscles, joints, discs, or nerves when it changes with movement, lifting, posture, or pressure on the area. Kidney pain is usually felt higher and farther to the side, beneath the lower ribs, and is more concerning when accompanied by fever, chills, nausea, blood in the urine, or changes in urination. These clues can help when comparing back pain versus kidney pain, but symptoms sometimes overlap, so location alone cannot confirm the cause.

Where Back Pain and Kidney Pain Are Usually Felt

The kidneys sit toward the back of the upper abdomen, just below the rib cage on either side of the spine. Pain related to a kidney problem is therefore often felt in the flank—the area between the lower ribs and hip—rather than directly over the center of the lower spine.

Kidney pain commonly affects one side, although both sides can hurt. It may remain in the flank or spread toward the abdomen, lower abdomen, or groin. For a more detailed explanation, see this guide to kidney pain symptoms and location.

Musculoskeletal back pain can occur anywhere along the spine but frequently affects the lower back. It may be centered over the spine, spread across both sides, or be limited to one sore muscle. A pinched or irritated nerve may send pain into a buttock, hip, or leg.

Back Pain Versus Kidney Pain at a Glance

Clue	More Typical of Back Pain	More Typical of Kidney Pain
Location	Center of the lower back or muscles beside the spine	Side of the back or flank, beneath the lower ribs
Effect of movement	May worsen with bending, twisting, lifting, sitting, or standing	Usually not strongly linked to a particular movement or position
Touch or pressure	Muscles may feel tight, sore, or tender	The flank may be tender, but ordinary muscle pressure may not reproduce the pain
Where pain travels	May spread to the buttock, hip, or leg	May spread to the abdomen, lower abdomen, or groin
Other symptoms	Stiffness, muscle spasm, leg tingling, numbness, or weakness	Urinary changes, fever, chills, nausea, vomiting, or blood in the urine
Common pattern	May begin after lifting, exercise, prolonged sitting, a fall, or an awkward movement	May be a steady ache with infection or severe pain that comes in waves with a stone

These are general patterns rather than diagnostic rules. Some back conditions cause pain near the flank, and a kidney problem may occasionally occur without obvious urinary symptoms.

Signs the Pain May Be Musculoskeletal

A muscle, joint, disc, or nerve problem becomes more likely when the pain:

Began after lifting, twisting, exercising, falling, or remaining in one position for a long time
Changes when you bend, turn, sit, stand, or lie in a particular position
Can be reproduced by pressing on a sore muscle
Occurs with back stiffness or muscle spasms
Travels down a buttock or leg
Comes with tingling, numbness, or weakness in a leg or foot

Back pain can range from a dull ache to a sharp or burning sensation. The exact pattern depends on which structures are involved. The National Library of Medicine provides additional information about common back pain causes, symptoms, and treatments.

Signs the Pain May Be Coming From a Kidney

Kidney-related pain is most commonly associated with an infection or a stone. The symptoms differ somewhat between these conditions.

Possible Kidney Infection

A kidney infection may cause a steady, aching pain in the side or back. According to the National Institute of Diabetes and Digestive and Kidney Diseases, kidney infection symptoms may also include:

Fever and chills
Frequent or painful urination
Cloudy, dark, bloody, or foul-smelling urine
Nausea or vomiting
Pain extending toward the groin

Most kidney infections begin when bacteria from a lower urinary tract infection move upward from the bladder. Prompt medical treatment is important because the infection can become serious.

Possible Kidney Stone

A kidney stone often causes intense, sharp pain that comes and goes in waves as the stone moves through the urinary tract. The pain may begin in the flank or back and travel toward the lower abdomen or groin. Other recognized symptoms of kidney stones include:

Pink, red, or brown urine
A frequent or urgent need to urinate
Pain during urination
Passing only a small amount of urine or being unable to urinate
Nausea or vomiting
Cloudy or bad-smelling urine

Fever or chills with suspected stone pain may indicate an infection occurring with urinary blockage and requires urgent evaluation.

How a Healthcare Professional Tells the Difference

A clinician will consider the pain’s exact location, when it started, what makes it better or worse, and whether urinary, digestive, or nerve symptoms are present. The physical examination may include checking the spine, muscles, strength, sensation, reflexes, abdomen, and flank.

If a kidney or urinary problem is suspected, testing may include:

A urinalysis to look for blood, signs of infection, or other abnormalities
A urine culture when infection is possible
Blood tests to evaluate kidney function and signs of infection
Ultrasound or computed tomography imaging when a stone, obstruction, or another structural problem is suspected

Back imaging is not necessary for every episode of uncomplicated back pain. A clinician may recommend imaging or other tests when there has been significant trauma, symptoms suggest nerve compression, pain persists, or another medical condition is suspected.

When to Seek Care

Contact a healthcare professional promptly for unexplained flank pain, visible blood in the urine, painful or unusually frequent urination, recurring pain, or pain that is not improving. A primary care clinician, urgent care professional, or urologist can evaluate possible kidney or urinary symptoms.

Seek urgent medical care for:

Flank or back pain with fever, chills, vomiting, confusion, or rapid breathing
Severe pain that comes in waves or cannot be controlled
Inability to urinate or passing very little urine
Back pain after a major fall, collision, or other significant injury
New loss of bladder or bowel control
Numbness around the groin or inner thighs
New or worsening weakness in one or both legs

Because several organs and structures can cause pain in the back or flank, persistent or severe symptoms should not be diagnosed by location alone. A medical evaluation can identify whether the source is musculoskeletal, urinary, kidney-related, or another condition requiring treatment.