How can you tell the difference between backpain and kidney pain?

See below. It can be difficult to distinguish between the two you need a medical examination and maybe some tests.
Different. Kidney pain is usually extremely sharp. Back pain is usually more global. The kidney pain is usually more localized and usually behind under the rib cage . However at times they can mimic one another. You truly need to be seen by your doctor and get a good physical examination.

Related Questions

How can you tell the difference between real kidney pain and just lower back pain?

Not always easy. Renal colic (pain from a kidney stone) is severe and crampy. It tends to be on one side, in the flank, but back pain can be similar. If you have blood in the urine, this points to the kidney. If you have had stones before or they run in the family, renal colic is more likely. Common back pain tends to be in the middle, but can be off to one side. Read more...
Spine vs kidney pain. Kidney pain is felt directly over the kidney but can radiate to the back (in other words you have pain in both areas). Back pain is felt closer to the spine and generally radiates to the hips, and back of the legs. Read more...

Can you actually tell the difference between kidney pain and muscular lower back pain?

I can. The major differences are in the physical exam not the description of pain and other subtlites fever strong smelling urine abnormal ua lean toward kidney pain kidney stone pain is very specidic colic severe. Read more...
Yes you could. Kidney pain is severe and occurs in waves. Pain experienced in the lower back to the left and right of spine and above the hips. Back pain; dull and continuous pain becoming worse with movement. Injury to back caused by mild sprains to severe cases of slip discs, cancer etc. Pain predominant in the back due to problems in muscles, nerves, bones and joints of the spinal cord. Thank you. Read more...