You have two kidneys, one on each side of your spine, tucked toward your back. They sit high in the abdomen, just below the rib cage, not down near the hips where many people expect them. In women, the positioning is the same as in men, though a few female-specific conditions can affect how kidney-related pain shows up.
Where Each Kidney Sits
Both kidneys are located behind the other abdominal organs, nestled against the muscles of your back wall. They sit roughly between the bottom of your rib cage and your waist, flanking either side of the spine. If you place your hands on your sides just below your lowest ribs, your kidneys are right behind your hands, closer to your back than your belly.
The right kidney sits slightly lower than the left because the liver, which is large and heavy, pushes it down. The left kidney is protected by both the 11th and 12th ribs, while the right kidney is mainly shielded by only the 12th rib. On the left side, the neighboring organs include the spleen, stomach, pancreas, and part of the small intestine. On the right side, the liver, the first section of the small intestine, and part of the colon sit in front of the kidney. Small hormone-producing glands (the adrenal glands) rest on top of each one like caps.
How to Identify Kidney Pain
Because the kidneys are positioned so far back and so high up, kidney pain often surprises people. You typically feel it under the ribs on one or both sides of the spine, in the area doctors call the flank. It often feels deeper than typical muscle soreness, as if it’s coming from inside rather than from the surface.
Kidney pain can show up in different ways depending on the cause. An infection often produces a constant, dull ache in the back along with fever. A kidney stone tends to cause severe, sharp pain that comes in waves and can radiate down toward the groin as the stone moves through the urinary tract. The pain usually stays on the side of the affected kidney, so a stone in the right kidney causes right-sided flank pain, and vice versa.
A quick way to distinguish kidney pain from ordinary back pain: regular back pain usually centers over the spine itself and may radiate down the legs, while kidney pain is off to one side and sits higher. Hip pain, which can also be confused with kidney problems, tends to be noticeably lower.
Conditions That Mimic Kidney Pain in Women
Women have an additional layer of complexity because reproductive organs sit in the same general region of the abdomen. Ovarian cysts, in particular, can produce pain that overlaps with kidney pain. The difference is mainly in location and character. An ovarian cyst usually causes pain lower in the abdomen, on the side of the affected ovary. It can be sharp or dull and may come and go. If a cyst ruptures, the pain can become suddenly severe.
Kidney stone pain, by contrast, typically starts higher, in the back and side below the ribs, then migrates downward toward the lower abdomen and groin as the stone travels. The pain tends to be sharp, sudden, and intensifying. If you’re unsure whether flank pain is coming from a kidney or an ovary, the height of the pain is your best clue: kidney pain originates closer to the rib cage, while ovarian pain is centered in the pelvis.
How Pregnancy Affects the Kidneys
During pregnancy, several changes put extra demand on the kidneys even though their physical position doesn’t shift dramatically. Blood flow to the kidneys increases by about 50%, which means they filter significantly more fluid than usual. This ramp-up begins in the first trimester and peaks around mid-pregnancy.
As the uterus grows, it can press on the bladder and the tubes that connect the kidneys to the bladder (the ureters), making it harder for the bladder to empty completely. At the same time, pregnancy hormones relax the muscles in those tubes, slowing urine flow. The combination of incomplete emptying and sluggish drainage creates a friendlier environment for bacteria, which is why urinary tract infections are more common during pregnancy. Left untreated, a UTI can travel up to the kidneys and cause an infection there, producing that characteristic deep flank pain along with fever and chills.
Feeling for Kidney Tenderness at Home
Doctors check for kidney inflammation by tapping firmly on the back just below where the lowest rib meets the spine, an area called the costovertebral angle. You can approximate this yourself. Place the heel of your hand on your back, right where your lowest rib ends near the spine, and give a firm tap. If that produces a sharp, deep ache rather than the dull soreness you’d get from a stiff muscle, the kidney on that side may be inflamed or infected. Pain on the right side points to the right kidney; pain on the left points to the left. Tenderness at this spot is one of the hallmarks of a kidney infection or, less commonly, an abscess around the kidney.