Lower abdominal pain has dozens of possible causes, ranging from trapped gas that resolves in hours to conditions that need prompt treatment. The most common culprits fall into three categories: digestive problems, urinary tract issues, and reproductive conditions. Where exactly the pain sits, what it feels like, and what other symptoms come with it can help narrow down what’s going on.
Digestive Causes Are the Most Common
Everyday digestive issues like gas, constipation, indigestion, and diarrhea are behind the majority of lower abdominal pain episodes. These tend to come with bloating, cramping, or a sense of pressure that shifts around and eases after a bowel movement or passing gas. If this describes your situation, you’re likely dealing with something temporary.
Irritable bowel syndrome (IBS) is a frequent cause of recurring lower abdominal pain. It’s typically diagnosed when you’ve had abdominal pain at least one day per week for three months, and that pain is linked to bowel movements or changes in how often you go or what your stool looks like. Symptoms need to have started at least six months before diagnosis. IBS pain often comes in waves and can alternate between constipation and diarrhea.
Inflammatory bowel disease (IBD), which includes Crohn’s disease and ulcerative colitis, causes inflammation in the intestinal lining and produces more persistent pain, sometimes with bloody stool, weight loss, or fatigue. Celiac disease, infections, and intestinal blockages can also inflame the small or large intestine and produce lower abdominal pain.
Pain Location Matters
The lower abdomen isn’t one uniform zone. Pain on the lower right side raises different concerns than pain on the lower left, and that distinction can be genuinely useful.
Lower right pain is the classic location for appendicitis, though the pain sometimes starts near the belly button before migrating. Appendicitis has a lifetime risk of roughly 7 to 9%, with incidence peaking in 15- to 19-year-olds. The pain usually intensifies over 12 to 24 hours, and it’s often accompanied by loss of appetite, nausea, or a low fever.
Lower left pain is often related to diverticulitis, a condition where small pouches in the colon wall become inflamed or infected. Diverticulosis (having the pouches) affects about 10% of people by age 40 and more than 50% of those over 60. Not everyone with diverticulosis develops diverticulitis, but when it happens, the pain is usually steady, focused on the lower left, and may come with fever or changes in bowel habits.
Central lower pain or pain that’s hard to pinpoint is more typical of bladder issues, reproductive conditions, or generalized intestinal cramping.
Urinary Tract Infections and Kidney Stones
A bladder infection (the most common type of urinary tract infection) frequently causes pain or discomfort in the lower abdomen, centered behind the pubic bone. The hallmark symptoms are a burning sensation when you urinate, frequent or urgent need to go even when your bladder is nearly empty, and cloudy, bloody, or strong-smelling urine. If you have lower abdominal pain plus any of those urinary symptoms, a UTI is a strong possibility.
Kidney stones tend to cause pain that starts in the back or side and radiates toward the lower abdomen and groin, usually on one side. The pain often comes in intense waves. Kidney infections can also refer pain to the lower abdomen, typically alongside fever, back pain, and painful urination.
Reproductive Causes in Women
For women, the pelvic organs sit right in the lower abdomen, so reproductive conditions are a common source of pain in this area.
Ovulation pain (sometimes called mittelschmerz) is a mild, temporary ache on one side of the lower abdomen that happens mid-cycle when an egg is released. It’s harmless and usually resolves within a day. Menstrual cramps are another obvious and frequent cause, producing central lower abdominal pain in the days around a period.
Ovarian cysts are fluid-filled sacs that often develop during the menstrual cycle and resolve on their own. Most cause no symptoms, but larger cysts or ones that rupture can produce sudden, sharp pain on one side. Endometriosis, where tissue similar to the uterine lining grows outside the uterus, causes chronic pelvic pain that often worsens around menstruation and may come with painful periods, pain during sex, or difficulty getting pregnant. Uterine fibroids, which are noncancerous growths in the uterus, can cause pressure, heaviness, or pain in the lower abdomen, particularly when they grow large.
Pelvic inflammatory disease (PID) is one of the most common causes of acute pelvic pain in young, sexually active women. It’s caused by sexually transmitted infections that spread upward from the cervix to the uterus, fallopian tubes, or ovaries. Symptoms range widely, from subtle discomfort to significant abdominal pain with fever, unusual vaginal discharge or bleeding, and pain during urination or sex.
Causes More Common in Men
Men experiencing lower abdominal pain without clear digestive or urinary symptoms may be dealing with prostatitis, which is inflammation of the prostate gland. Chronic prostatitis (also called chronic pelvic pain syndrome) causes pain or discomfort lasting three months or more in the central lower abdomen, between the scrotum and anus, or in the lower back. It often comes with urinary frequency or urgency, a weak urine stream, and pain during or after ejaculation. The exact cause is often unclear, though it may involve prior infections, immune system responses, or nerve irritation in the pelvic area.
Acute bacterial prostatitis is less common but more dramatic. It causes sudden lower abdominal and groin pain alongside fever, chills, painful urination, and sometimes nausea and vomiting. This form requires prompt treatment. Inguinal hernias, where tissue pushes through a weak spot in the abdominal wall near the groin, can also produce aching lower abdominal pain that worsens with lifting, coughing, or standing for long periods.
Muscle Strain vs. Internal Pain
Not all lower abdominal pain comes from inside. A strained abdominal muscle can mimic internal problems and lead to unnecessary worry. There are a few reliable ways to tell the difference.
Abdominal wall pain from a muscle strain tends to be localized to one small, tender spot. It stays the same or gets worse when you tense your abdominal muscles, such as when doing a sit-up or lifting your head while lying down. Internal organ pain, by contrast, usually feels deeper, is harder to pinpoint with one finger, and tends to ease when you tense the abdominal wall because the contracted muscles act as a shield over the organs.
Muscle strain also doesn’t come with other systemic symptoms. If you have no fever, no nausea, no changes in your bowel or urinary habits, and no unusual discharge or bleeding, and the pain is in a specific spot that hurts more when you move, abdominal wall strain is worth considering. Imaging and blood work typically come back normal in these cases.
How Lower Abdominal Pain Is Diagnosed
When lower abdominal pain is persistent or concerning enough to see a doctor, the workup usually starts with a physical exam and questions about the pain’s location, timing, and associated symptoms. From there, urine tests can check for infections or kidney stones, and blood work can look for signs of infection or inflammation.
Imaging depends on what’s suspected. Ultrasound is a first-line tool for evaluating reproductive and urinary conditions, and it works well for appendicitis in people who aren’t significantly overweight. CT scans offer the most detailed look and are the go-to for suspected diverticulitis. Low-dose CT scans can confirm appendicitis or kidney stones with much less radiation than standard scans. For pelvic pain in women, transvaginal ultrasound provides a close view of the uterus, ovaries, and fallopian tubes.
Signs You Need Immediate Care
Most lower abdominal pain resolves on its own or with straightforward treatment, but certain patterns warrant emergency attention. Seek immediate care if the pain is sudden and severe, if it doesn’t ease within 30 minutes, or if it’s accompanied by continuous vomiting. Severe lower right abdominal pain with nausea, loss of appetite, and fever suggests possible appendicitis. Severe abdominal pain with vaginal bleeding in someone who could be pregnant may indicate an ectopic pregnancy, which is a medical emergency. A swollen, rigid abdomen that’s extremely tender to touch, or pain paired with high fever and a rapid pulse, also calls for urgent evaluation.