The right side of your abdomen contains several major organs, including your liver, gallbladder, appendix, right kidney, and portions of your intestines. These organs are stacked across two zones: the upper right area (from your ribs to your navel) and the lower right area (from your navel to your pelvis). Knowing what sits where helps you make sense of any pain or discomfort you feel on that side.
Upper Right: Liver, Gallbladder, and More
The largest organ on your right side is the liver, which fills most of the space beneath your right ribcage. It filters toxins from your blood, produces bile for digestion, and processes nutrients from everything you eat. Tucked just underneath the liver is the gallbladder, a small, pear-shaped pouch that stores bile until you eat a meal. When food hits your small intestine, the gallbladder contracts and releases that bile to help break down fats.
Also in this upper zone are the head of the pancreas, a section of the small intestine called the duodenum, and a bend in the large intestine known as the hepatic flexure. Your right kidney sits behind these organs, pressed against the back muscles just below the ribs. The right renal artery, which feeds blood to that kidney, runs alongside it. A portion of the abdominal aorta, the body’s main artery, also passes through the midline of this region.
Lower Right: Appendix, Cecum, and Colon
The lower right side is home to the appendix, a finger-shaped pouch that projects off the large intestine. Just above it is the cecum, a roughly 3-inch pocket that receives digested food waste from the small intestine and funnels it into the ascending colon. The ascending colon is about 8 inches long and runs upward along the right side of your abdomen, absorbing water and electrolytes from waste before pushing it across to the left side.
In biological females, the right ovary and right fallopian tube also sit in this lower region, near the pelvis. Because the ovary is so close to the appendix, kidneys, and intestines, pain from any of these organs can feel similar, making it tricky to pinpoint the source without imaging.
Muscles That Cover Everything
Layered over all of these organs is the abdominal wall, a stack of muscles that protects your internal organs and helps you twist, bend, and stabilize your trunk. The outermost layer is the external obliques, which run from the sides of your body toward the middle. Beneath them sit the internal obliques, and deeper still is the transversus abdominis, the thinnest layer. Running down the center on either side is the rectus abdominis, the pair of muscles people associate with a “six-pack.”
These muscles can be strained by overstretching, overuse, or a sudden twisting motion. A significant strain causes pain that flares when you exercise, laugh, cough, or sneeze, along with possible swelling, muscle spasms, or bruising. This type of pain typically worsens with movement, which is one way to distinguish it from organ-related pain deeper inside.
Common Causes of Right-Side Pain
Gallstones
Gallstones form when bile hardens into solid pieces inside the gallbladder. If a stone blocks one of the ducts, you can experience sudden, rapidly intensifying pain in the upper right abdomen, sometimes radiating to your right shoulder or between your shoulder blades. This pain can last anywhere from several minutes to a few hours and often comes with nausea or vomiting. A stone stuck in the neck of the gallbladder can trigger inflammation (cholecystitis), causing severe pain and fever. Stones can also block the pancreatic duct, leading to intense, constant abdominal pain that typically requires hospitalization.
Appendicitis
Appendicitis is one of the most well-known causes of lower right abdominal pain. In most people, the pain starts as a vague ache around the belly button and then migrates to the lower right side over several hours. Other symptoms include loss of appetite, nausea, vomiting, fever, and sometimes diarrhea. This is a time-sensitive condition because a burst appendix can become life-threatening.
Kidney Issues
Because your right kidney sits against the back muscles below the ribs, kidney problems often feel like deep flank pain, on the side of your spine below the ribcage. Unlike a muscle strain, kidney pain does not worsen or improve with movement and typically stays in one area, though it can spread to the lower abdomen or inner thighs. Kidney stones may also cause fever, nausea, an urgent need to urinate, or blood in the urine.
Reproductive Organ Pain
In biological females, conditions involving the right ovary or fallopian tube can cause pain that feels like it’s coming from the lower stomach. Ovarian cysts, ovulation pain, and ectopic pregnancy can all produce lower abdominal discomfort on the right side. Ectopic pregnancy symptoms include lower abdominal pain, vaginal bleeding or spotting, shoulder-tip pain, nausea, and feeling faint. This is a medical emergency.
How Right-Side Pain Gets Diagnosed
When you go in for right-side abdominal pain, an ultrasound is typically the first imaging test. It’s quick, noninvasive, and good at revealing gallstones, kidney stones, and ovarian issues. If the ultrasound doesn’t show a clear answer and you don’t have a fever or elevated white blood cell count, a CT scan or MRI is usually the next step. When there is a fever or signs of infection, imaging choices may include a CT scan with contrast or a specialized nuclear scan that tracks how bile moves from the liver through the gallbladder into the intestine.
For lower right pain, CT scans are particularly useful for confirming appendicitis. In pregnant individuals, MRI is often preferred to avoid radiation exposure.
Warning Signs That Need Immediate Attention
Sudden, severe abdominal pain that keeps getting worse should never be brushed off. Seek emergency care if you vomit blood or material that looks like coffee grounds, pass blood in your stool, or notice black, tarry stools. A sudden burst of severe abdominal pain that radiates to the back, groin, or legs, especially with faintness and nausea, can signal a ruptured abdominal aortic aneurysm, which is life-threatening. Similarly, lower abdominal pain combined with vaginal bleeding, shoulder pain, and lightheadedness may point to an ectopic pregnancy that needs immediate treatment.