Lower stomach pain has dozens of possible causes, ranging from temporary digestive issues that resolve on their own to conditions that need prompt medical attention. The location, type of pain, and accompanying symptoms all help narrow down what’s going on. In most cases, lower abdominal pain comes from the intestines, bladder, or reproductive organs.
Where Exactly It Hurts Matters
Your lower abdomen houses several organs packed into a relatively small space: the end of the small intestine, the large intestine (including the appendix on the right side), the bladder, and reproductive organs. Pain on the right side points to a different set of possibilities than pain on the left, and pain in the center suggests something else entirely.
Pain in the lower right side is most commonly associated with appendicitis, inguinal hernias, or a bowel obstruction. Lower left pain is more typical of diverticulitis (inflamed pouches in the colon wall), colitis, or inflammatory bowel disease. Pain in the center, just above the pubic bone, often involves the bladder or, in some cases, the appendix or colon. Pain on either side can also stem from ovarian cysts or ovarian torsion in women, or testicular torsion in men.
Common Digestive Causes
The most frequent explanation for lower abdominal pain is something happening in your gut. Constipation, gas, and mild stomach bugs cause crampy, uncomfortable pain that typically comes and goes and resolves within hours or a couple of days. This kind of pain usually doesn’t wake you from sleep or get progressively worse.
Two chronic conditions commonly cause recurring lower abdominal pain: irritable bowel syndrome (IBS) and inflammatory bowel disease (IBD). They share some symptoms but are fundamentally different. IBS involves uncoordinated contractions of the intestines and hypersensitive gut nerves, but there’s no visible damage to the digestive tract. You get cramping, diarrhea, constipation, or a mix of both. IBD, which includes Crohn’s disease and ulcerative colitis, is caused by a malfunctioning immune system that chronically inflames and damages the digestive lining. IBD tends to produce more severe symptoms: fevers, bloody bowel movements, and weight loss on top of the pain and cramping. If you’re seeing blood in your stool or running fevers alongside abdominal pain, that distinction matters.
Diverticulitis is another common culprit, particularly in adults over 40. It causes pain that’s usually concentrated on the lower left side, often accompanied by fever and changes in bowel habits.
Appendicitis Has a Recognizable Pattern
Appendicitis deserves its own mention because it’s common, time-sensitive, and follows a distinctive pattern that’s useful to recognize. The pain typically starts as a vague ache around the belly button, then over the course of 12 to 24 hours migrates to the lower right side, where it becomes sharper and more localized. About 75% of people with appendicitis show up for medical care within 24 hours of symptoms starting.
Timing matters here. The risk of the appendix rupturing sits around 2% at 36 hours from when symptoms begin, then climbs roughly 5% for every additional 12 hours without treatment. A ruptured appendix is a serious complication. If you have pain that started near your navel and has shifted to your lower right abdomen, especially with nausea or fever, that’s a situation where getting checked quickly makes a real difference.
Urinary Tract Problems
Bladder infections and kidney stones both cause lower abdominal pain, but the type and location of pain help tell them apart. A urinary tract infection (UTI) typically produces a pressure or stabbing feeling in the lower abdomen near the pubic bone, along with a burning sensation when you urinate. Kidney stones cause sharper, more stabbing pain that tends to hit your back, side, or groin rather than sitting right in the center of your lower belly. Blood in the urine is more typical of kidney stones, though UTIs can sometimes cause it too.
Kidney infections (a more serious progression of a UTI) add flank pain and fever to the mix. If lower abdominal pain comes with urinary symptoms like burning, urgency, or blood in your urine, the urinary tract is a likely source.
Causes Specific to Women
The reproductive organs sit in the lower pelvis, so gynecological conditions are a frequent cause of lower abdominal pain in women. Menstrual cramps are the most obvious and common example, but several other conditions produce pain that’s easy to confuse with a digestive issue.
Ovarian cysts are fluid-filled sacs that develop on the ovaries, and most come and go without symptoms. When a cyst bleeds or ruptures, though, it can cause sudden, intense pain on one side of the lower abdomen. In severe cases, a ruptured cyst causes enough internal bleeding to drop blood pressure. Ovarian torsion, where the ovary twists on its blood supply, produces similar sudden one-sided pain and requires emergency treatment to save the ovary.
Endometriosis causes chronic pelvic pain that tends to follow a cyclical pattern, worsening around menstruation. The pain comes from tissue similar to the uterine lining growing outside the uterus, where it bleeds and causes inflammation with each menstrual cycle. Pelvic inflammatory disease (PID), usually caused by sexually transmitted infections, produces lower abdominal pain alongside fever, unusual vaginal discharge, pain during sex, or painful urination. PID can range from mild discomfort to severe illness.
An ectopic pregnancy, where a fertilized egg implants outside the uterus (usually in a fallopian tube), causes lower abdominal pain that can become life-threatening if the tube ruptures. Any lower abdominal pain with a missed period warrants a pregnancy test.
Causes Specific to Men
Inguinal hernias are more common in men and occur when a portion of the small intestine pushes through a weak spot in the lower abdominal wall near the groin. This creates a painful or tender lump on one or both sides of the groin, and the discomfort gets worse with lifting, coughing, sneezing, or exercise. Surgery is the only way to repair a hernia and stop it from causing ongoing pain.
Prostatitis, or inflammation of the prostate gland, affects a large percentage of men who deal with persistent pelvic pain. It causes aching in the lower abdomen and upper thighs, along with painful or difficult urination, and sometimes fever or blood in the urine. Testicular torsion, where the testicle twists on the cord that supplies its blood, causes sudden, severe pain that often radiates from the groin up into the lower abdomen. The scrotum may visibly swell. This is a time-sensitive emergency because the testicle can lose blood supply permanently.
How Pain Type Helps Identify the Cause
The character of your pain carries useful information. Crampy pain that comes in waves often points to something muscular or intestinal, like gas, constipation, or a stomach bug. Sharp, localized pain that gets worse when you press on a specific spot or move around suggests inflammation or irritation of a particular organ, as in appendicitis or a ruptured cyst. Dull, constant aching is more typical of chronic conditions like endometriosis, prostatitis, or IBS. Sudden, severe pain that hits out of nowhere raises the possibility of torsion (ovarian or testicular), a ruptured cyst, or a kidney stone.
Pain that started mild and is steadily getting worse over hours is more concerning than pain that peaked and is now fading. Similarly, pain that’s accompanied by fever, vomiting, or an inability to pass gas or have a bowel movement suggests something more urgent than pain on its own.
What Happens When You Get It Checked
If your lower abdominal pain is severe enough or persistent enough to see a doctor, the workup typically starts with questions about exactly where it hurts, when it started, what makes it better or worse, and what other symptoms you have. A physical exam involves pressing on different areas of your abdomen to check for tenderness.
Blood and urine tests can reveal signs of infection, inflammation, or pregnancy. If the cause isn’t clear from the exam and lab work, imaging is the next step. A CT scan with contrast is the go-to for lower abdominal pain when the diagnosis is uncertain. One large study found that CT changed the leading diagnosis in 51% of patients who came to the emergency department with abdominal pain, which speaks to how tricky it can be to pin down the cause from symptoms alone. Ultrasound is preferred over CT for pregnant women and children to avoid radiation exposure, and it’s also useful for evaluating ovarian problems.
Signs That Need Immediate Attention
Most lower abdominal pain turns out to be something manageable, but certain combinations of symptoms signal a potential emergency. Sudden, severe pain that comes on all at once is one. Pain that’s steadily worsening over several hours is another. Vomiting blood, stool that’s black or tarry, visible blood in your stool, a rigid abdomen that’s painful to touch, or signs of shock like dizziness and rapid heartbeat all warrant an emergency room visit. In men, sudden testicular pain with scrotal swelling needs same-day evaluation. In women, severe one-sided pelvic pain or lower abdominal pain with a missed period should be evaluated urgently.