Pain in your lower right abdomen has a wide range of possible causes, from a pulled muscle to appendicitis. The location narrows things down significantly because specific organs and structures sit in that quadrant: your appendix, the end of your small intestine, the right ovary in women, and the inguinal canal in men. What the pain feels like, how it started, and what other symptoms you have are the biggest clues to what’s going on.
Appendicitis: The Most Urgent Possibility
Appendicitis is the first thing most people (and most doctors) think of with lower right abdominal pain, and for good reason. It’s the most common abdominal emergency requiring surgery. The classic pattern starts as a vague ache around your belly button that hovers or comes and goes for several hours, then migrates to the lower right side and becomes sharper and more constant. Nausea and vomiting typically develop as the pain intensifies.
Only about half of people with appendicitis follow that textbook pattern, though. Some people feel the pain in the lower right side from the start. Others have dull, diffuse discomfort that’s hard to pinpoint. A few signs that strongly suggest appendicitis: the pain gets worse when you walk, cough, or go over a bump in the car. Pressing on the lower right side and then quickly releasing your hand causes a sharp spike of pain. You may also notice a low-grade fever and a complete loss of appetite.
If your pain is sudden, severe, or doesn’t ease within 30 minutes, that warrants an emergency room visit. Continuous, severe abdominal pain paired with nonstop vomiting is another signal to go immediately. An untreated appendix can rupture, which turns a straightforward surgery into a much more serious situation.
Inguinal Hernia
Inguinal hernias happen when tissue pushes through a weak spot in the lower abdominal wall near the groin. They develop on one side, and the right side is more common than the left. Men are affected far more often than women due to a natural weakness in the inguinal canal where the spermatic cord passes through.
The hallmark is a visible or palpable bulge in the groin or, in men, the scrotum. The area often feels heavy, achy, or burning rather than sharp. Symptoms get worse when you strain, lift something, cough, or stand for a long time, and they improve when you lie down. Many hernias can be gently pushed back into the abdomen, which temporarily relieves discomfort.
A hernia becomes dangerous when it gets stuck (incarcerated) or loses its blood supply (strangulated). Warning signs include a bulge that suddenly gets larger and won’t go back in, fever, redness over the area, severe tenderness, or symptoms of a bowel blockage like bloating, nausea, and vomiting. A strangulated hernia is a surgical emergency.
Kidney Stones and Urinary Tract Infections
Both kidney stones and UTIs can send pain to the lower abdomen, but they feel quite different. A kidney stone produces sharp, stabbing pain that usually starts in the back or side of your lower torso and can radiate toward the groin as the stone moves down the ureter. The pain tends to come in intense waves. Blood in your urine is more typical of a kidney stone than a UTI.
UTI pain, particularly in women, tends to center lower in the abdomen around the pubic bone and is accompanied by a burning sensation during urination, frequent urges to go, and sometimes cloudy or strong-smelling urine. A UTI that climbs to the kidney can produce flank pain and fever, which may feel closer to a kidney stone. Either condition needs medical evaluation, but kidney stones that cause persistent vomiting, fever, or inability to urinate need urgent care.
Crohn’s Disease and Ongoing Pain
If your lower right abdominal pain isn’t new but keeps coming back over weeks or months, Crohn’s disease is one possibility worth considering. This inflammatory bowel condition most commonly affects the end of the small intestine and the beginning of the large intestine, both of which sit in the lower right abdomen. That’s why Crohn’s so often mimics appendicitis in its early stages.
The pain from Crohn’s is typically crampy rather than sharp, and it comes with other symptoms: persistent diarrhea, fatigue, reduced appetite, weight loss, and sometimes blood in the stool or fever. Some people develop mouth sores or pain around the anus. In more severe cases, the inflammation can affect joints, skin, and eyes. If you’ve had recurring bouts of cramping, diarrhea, and lower right pain, it’s worth bringing up with your doctor, as Crohn’s is often diagnosed late because people attribute their symptoms to something less serious.
Muscle and Hip Flexor Strain
Not every pain in the lower right abdomen comes from an organ. The psoas muscle, a deep hip flexor that runs from the lower spine through the pelvis, can cause pain in the lower back, hip, groin, and lower abdomen when it’s strained or inflamed. This is frequently misdiagnosed or overlooked because the symptoms overlap with so many other conditions, including hernias, hip injuries, and even appendicitis.
A clue that the pain is muscular: it gets worse with specific movements like lifting your knee toward your chest, climbing stairs, or getting up from a seated position, and it eases with rest. There are no accompanying digestive symptoms like nausea, changes in bowel habits, or loss of appetite. If you recently increased your exercise intensity, started a new sport, or spent a lot of time sitting, a hip flexor issue is plausible.
Ovarian Causes in Women
The right ovary sits in the lower right abdomen, so ovarian cysts, ovulation pain (mittelschmerz), and ovarian torsion can all produce pain in this area. Ovulation pain is mild to moderate, occurs mid-cycle, and resolves within a day or two. An ovarian cyst that ruptures causes a sudden, sharp pain that may be intense but usually improves on its own over hours. Ovarian torsion, where the ovary twists on its blood supply, causes sudden severe pain along with nausea and vomiting and requires emergency treatment.
Ectopic pregnancy is another possibility in women of reproductive age. If you’re sexually active, your period is late or unusual, and you’re having one-sided lower abdominal pain, this needs to be ruled out quickly because a ruptured ectopic pregnancy can cause life-threatening bleeding.
How to Read Your Symptoms
The combination of your pain’s character, timing, and accompanying symptoms is more telling than the location alone. A few patterns to pay attention to:
- Sharp and sudden, getting worse over hours: appendicitis, ovarian torsion, or a ruptured cyst. These generally need same-day evaluation.
- Comes in waves with back or flank involvement: kidney stone. Especially if you notice blood when you urinate.
- Dull ache with a visible bulge near the groin: inguinal hernia. Worse with straining, better lying down.
- Crampy and recurring over weeks, with diarrhea or weight loss: possible Crohn’s disease or another inflammatory condition.
- Worse with movement, better with rest, no digestive symptoms: muscular or hip flexor strain.
Fever paired with abdominal pain raises the stakes for nearly every cause on this list. A fever alongside lower right pain suggests your body is fighting an infection or inflammation that may need treatment. The same applies to pain that wakes you from sleep, which rarely has a benign explanation.