Your organs are spread across three main cavities in your body: the chest (thoracic cavity), the abdomen, and the pelvis. A muscular sheet called the diaphragm separates your chest from your abdomen, while the bowl-shaped bones of your pelvis cradle the organs at the bottom of your trunk. Here’s a practical guide to where everything sits.
Organs in Your Chest
Your rib cage exists primarily to protect the five organs housed in your thoracic cavity: the heart, lungs, esophagus, trachea (windpipe), and thymus. The heart sits slightly left of center, nestled between the two lungs in a space called the mediastinum. It’s enclosed in its own protective sac and rests on the upper surface of the diaphragm. Your lungs fill most of the chest cavity on either side of the heart, extending from just above the collarbones down to the diaphragm.
The esophagus, the tube that carries food from your throat to your stomach, runs behind the heart along the spine. The trachea sits in front of the esophagus and branches into two airways that feed each lung. The thymus, a small gland involved in immune function, sits in the upper chest just behind the breastbone. It’s most active during childhood and gradually shrinks with age.
Upper Abdomen: Right Side
The liver dominates the right upper portion of your abdomen. It’s the largest solid organ in your body, stretching from about the fifth rib space down to the lower edge of your right rib cage. Because of its size, a portion of the liver also crosses the midline into the upper left abdomen, but the bulk of it sits on the right. Tucked against the liver’s underside is the gallbladder, a small pouch that stores bile for digesting fats. The right kidney sits behind these organs, toward your back.
A small portion of the stomach and the first curve of the small intestine (the duodenum) also occupy this area, along with the head of the pancreas and parts of the large intestine as it bends upward on the right side.
Upper Abdomen: Left Side
Your stomach sits in the left upper abdomen, curving beneath the left side of the diaphragm. It’s more to the left than most people expect. The spleen, the body’s largest lymphoid organ, is wedged deep behind the stomach, between the diaphragm and the left kidney. You can’t feel it under normal conditions because the lower ribs shield it.
The pancreas stretches horizontally across the upper abdomen, mostly behind the stomach. Its head is on the right (near the duodenum) and its tail reaches left toward the spleen. The left kidney mirrors the right, sitting against the back wall of the abdomen. The left kidney actually sits slightly higher than the right because the liver pushes the right one down.
The Kidneys and Adrenal Glands
Both kidneys are positioned toward the back of your abdomen, behind the other organs, roughly at the level of the lowest ribs. The left kidney spans from about the twelfth thoracic vertebra to the third lumbar vertebra. The right kidney sits a bit lower due to the liver above it. The upper portions of both kidneys are partially protected by the eleventh and twelfth ribs, which is why a hard blow to the lower back can sometimes injure a kidney.
Perched on top of each kidney like a small cap is an adrenal gland. These glands produce hormones that regulate stress responses, blood pressure, and metabolism. They’re small but essential, and their position directly on the kidneys is how they got their name (adrenal means “near the kidney”).
Lower Abdomen
The lower abdomen is filled largely with intestines. The right lower quadrant contains the cecum, which is the beginning of the large intestine, along with the appendix, which dangles from the cecum. This is why appendicitis pain typically localizes to the lower right side. Parts of the small intestine weave through this area as well.
The left lower quadrant holds more of the small intestine along with portions of the large intestine, specifically the descending colon as it travels downward on the left side. The area around the navel is packed with loops of small intestine and the transverse colon, which crosses horizontally from right to left like a bridge connecting the ascending and descending sections of the large intestine.
Organs in the Pelvis
The pelvic cavity, cradled within the hip bones, contains the bladder at the front, the rectum at the back, and part of the descending colon. In women, the uterus sits between the bladder and rectum, with the fallopian tubes extending from either side toward the ovaries. In men, the prostate gland wraps around the urethra just below the bladder.
These organs are well protected by the bony ring of the pelvis, which is one of the strongest skeletal structures in the body. The bladder’s position behind the pubic bone means it’s shielded from most direct impacts, though a very full bladder rises above the pelvic brim and becomes more vulnerable.
Why Some Organs Sit Slightly Off-Center
The body is not perfectly symmetrical inside. Your heart tilts to the left. Your liver fills the right side and pushes the right kidney lower. The stomach and spleen sit to the left. The appendix hangs on the right. This asymmetry is consistent across nearly all people, but in a rare condition called situs inversus totalis, all the organs are flipped to mirror-image positions. This affects roughly 1 in 10,000 people, is slightly more common in males, and usually causes no health problems on its own. Most people with the condition don’t know they have it until imaging reveals the reversal.
Understanding where your organs are located can help you recognize when pain in a specific area might point to a particular organ. Right upper abdominal pain near the rib cage, for example, is worth considering in the context of the liver or gallbladder. Left-sided pain under the ribs could involve the spleen, stomach, or left kidney. Lower right pain is the classic location for appendicitis. The body’s internal geography is remarkably consistent from person to person, which is exactly what makes location such a useful clue.