Right-Side Back Pain: Spine, Muscle or Kidney?

"Doctor, the pain is only on the right side. Is it my kidney?" I hear this question often, and the worry behind it is fair. The right side of the back sits over muscles, the spine, the right kidney, and close to the liver and gallbladder. The pain can come from any of them.

The good news: a few simple features usually point you in the right direction.



Muscle or spine pain: the most common cause

Most back pain, on either side, comes from muscles, ligaments and the small joints of the spine. Doctors call it non-specific or mechanical back pain.

Typical features:

  • Started after lifting, bending, a long bus ride or sleeping awkwardly
  • Worse with movement, bending or twisting; easier when you lie still
  • Tender to press on the muscle beside the spine
  • No fever, no change in urine

Pain that shoots down the back of the right leg below the knee, with tingling, suggests a pinched nerve (sciatica), usually from a disc.

Kidney stone pain feels different

  • Comes in waves, building to severe and then easing
  • Felt in the flank (the side, just below the ribs), often spreading to the groin or front of the abdomen
  • You cannot find a comfortable position; patients often pace or roll
  • Nausea or vomiting
  • Blood in the urine, or reddish/brown urine

Stones are common, and many patients carry a metabolic reason for them. A 2026 Indian study of stone formers found that 84% had at least one identifiable metabolic risk factor, most often high urine calcium. Low water intake in hot weather adds to the risk.

Kidney infection

Fever with chills, burning while passing urine, and a dull ache in the flank suggest a kidney infection. This needs prompt treatment with antibiotics. It is not something to manage with a pain balm.

Other causes of right-side upper back pain

  • Gallbladder: pain under the right ribs that can spread to the right shoulder blade, often after an oily meal
  • Fever with body ache: during dengue and typhoid season, severe back and body ache with fever is common. Get tested rather than treating it as a back problem.
  • Shingles: burning pain on one side, followed a few days later by a band of blisters

Warning signs: see a doctor the same day

Recent systematic reviews (via PubMed) looked at which "red flags" actually point to serious spine problems. Single signs are often unreliable, but the stronger warning features include:

  • A history of cancer
  • Numbness around the private parts or inner thighs (saddle anaesthesia)
  • Difficulty passing urine or loss of bladder or bowel control
  • Infection after a spinal procedure or injection
  • Older age, especially with a minor fall or long-term steroid use (possible fracture)

Other features that deserve attention: fever, unexplained weight loss, constant pain at night that does not ease with rest, and weakness in a leg.

Simple tests that usually settle the question

  • Urine routine test: blood or pus cells point to a stone or infection
  • Ultrasound of the abdomen: shows kidney stones, swelling of the kidney and gallstones
  • X-ray or MRI of the spine: only when red flags are present or pain is not improving after several weeks

For ordinary muscle and spine pain

  • Stay active. Bed rest for more than a day or two slows recovery.
  • Use a warm compress for 15–20 minutes
  • Take a short course of pain relief as advised by your doctor
  • Return to normal work gradually; walking helps

Next step: If your right-side back pain comes in waves, spreads to the groin, or comes with fever or burning urine, get a urine test and an ultrasound before seeing anyone for your spine.

Related reading

References

  1. Skelly AC, Chou R, Brodt ED, et al. Assessment and treatment of acute low back pain: a systematic review. Pain Med. 2026. doi:10.1093/pm/pnag131 (via PubMed)
  2. Maselli F, Palladino M, Barbari V, et al. The diagnostic value of red flags in thoracolumbar pain: a systematic review. Disabil Rehabil. 2022;44(8):1190–1206. doi:10.1080/09638288.2020.1804626 (via PubMed)
  3. Navriya SC, Madhav PL, et al. Metabolic evaluation in first time and recurrent urinary stone formers: study from a tertiary care centre of India. World J Nephrol. 2026;15(3):120119. doi:10.5527/wjn.120119 (via PubMed)

About the author

Dr Markandaiya Acharya, MBBS, MS (Orthopaedics), Orthopaedic Surgeon. OCMR Reg. No. 22788.

This article is for public health education and does not replace an in-person consultation.

Consultation (by appointment only)
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