Kidney pain vs. back pain: Understand the difference

Kidney PainThe human body is intricate and complex, being home to lots of potential diseases and viruses. Every illness displays some sort of symptom we can recognize and document for the sake of finding a treatment, but sometimes the symptoms of two very different conditions can overlap, creating confusion.

This is the case with back pain and kidney pain. Both present very similarly but have completely different causes. Knowing the symptoms, triggers, and characteristics of these conditions can help you differentiate the two.

Difference between kidney pain and back pain


Back pain is signified by pain experienced anywhere in the lower back or buttocks. Kidney pain, on the other hand, is also experienced in the back, but it usually occurs in the portion between the ribs and hips called the flank.

The severity of back pain changes throughout the day. Kidney pain is usually constant, displaying a pain that is sharp in nature or sometimes dull. The point is that kidney pain does not fluctuate or get better until the problem in the kidney is treated.

The location of back pain also varies. It may extend to the neck, upper back, or remain in the lower back, depending on the site of injury. Varying degrees of pain are also used to describe back pain, with “acute” being back pain that exists for four weeks, “sub-acute” being four to twelve weeks, and “chronic” lasting more than 12 weeks.

Kidney pain is typically classified as being severe or minor, as the different causes can lead to a varying severity of pain. Kidney stones, for example, will produce a severe flank pain possibly associated with nausea and vomiting.

Back pain is also known to spread or radiate to other parts of the body, such as the back of the thigh, buttock, calf, or foot. Kidney pain may spread to the lower abdomen and inner thigh.

Kidney pain vs. back pain causes

Back pain may be caused by:

  • Sciatica
  • Backbone fractures (vertebral body fracture)
  • Fracture of pedicle
  • Fracture of lamina
  • Disc bulge
  • Disc herniation
  • Spinal stenosis
  • Osteoporosis
  • Metastatic vertebral cancer
  • Paravertebral muscle spasm

Kidney pain may be caused by:

Kidney pain vs. back pain symptoms

Despite having pain in a similar location, symptoms that are unique to each condition do exist. Back pain, for example, is most commonly due to a traumatic injury to the bones in the spinal cord. Kidney pain, however, is commonly caused by a physical obstruction within the organ or a bacterial infection. The following are the various symptoms found in each condition:

Possible back pain symptoms include:

  • Fever
  • Swelling on the back
  • Persistent back pain
  • Pain traveling down the legs
  • Pain reaching the knees
  • A recent injury to the back
  • Urinary incontinence
  • Difficulty urinating
  • Fecal incontinence
  • Numbness around the genitals
  • Numbness around the anus
  • Numbness around the buttock

Possible kidney pain symptoms include:

Kidney pain vs. back pain treatment

Back pain treatment differs significantly from kidney pain treatment, owing to their vastly different causes.

Pain in the back is treated using pain relieving medications along with several types of physical therapy. These include massage therapy, heat therapy, and cold therapy. Rarely, cases of back pain are severe enough to require surgical intervention.

Kidney pain treatment occurs once the source for its occurrence has been located. Kidney stones will employ the use of pain medication along with increased amounts of water ingestion to accelerate the kidney stone. Surgery may be required in cases of particularly large kidney stones. In cases of infection, antibiotics are favored to help eradicate the bacterial infection.

Difference between kidney pain and lower back pain
PAINKIDNEYLOWER BACK (spine, spinal cord, spinal nerves, back muscles)
LocationIn one or both flanks (the area between the lower ribs and hips) or, additionally, in the upper abdomenAnywhere in the lower back or upper buttocks
CharacteristicsCan be sharp and severe (kidney stone), dull (kidney infection) or throbbing, but usually more constant (until it lasts) than back painChanges with the body position and the time of the day
TriggersDrinking large amount of fluids (in ureteropelvic junction [UPJ] obstruction)

Usually not triggered by moving

Moving (in back injury)

Prolonged sitting, lying, standing (sciatic pain)

RelieversNo typical relievers, except treating the underlying diseaseWalking (in pinched nerve)

Resting (in osteoarthritis)

Pain radiationTo lower abdomen, groin, inner thigh (in urinary stones or kidney infection)To buttock, back of the thigh, calf, foot, toes on one or both sides (in sciatica)

Nausea, vomiting, anorexia

Excessive urination (polyuria)

Cloudy or dark urine

Burning urination

Body swelling (edema)

Numbness or tingling in the foot or toes (one or both sides)
Visible changesNone (in most cases)

Visible mass in one flank (in a large kidney tumor) or in both flanks (in polycystic kidney disease or hydronephrosis)

Bruise (in back muscle injury)


Bending or limping (in spondyloarthritis or due to pain in pinched nerve)

Curved spine and uneven hips (in scoliosis)

Tenderness to the touchOnly sometimes, and usually limited to the area over the kidneyOver or near the spine (in spondylitis)

Anywhere (back injury, muscle strain)

Palpable changesRarely, a lump in kidney tumor or hydronephrosis, otherwise noneOften, muscle tightness as a reaction to pain
More detailsSymptoms of the kidney pain depending on the cause


Related Reading:

15 tips to relieve kidney pain naturally

Right flank pain: Causes and symptoms