Lower stomach pain has dozens of possible causes, ranging from mild digestive issues that pass on their own to conditions that need prompt medical attention. Where exactly the pain sits, how it feels, and what other symptoms come with it are the biggest clues to what’s going on. Your lower abdomen houses portions of your small and large intestine, your bladder, and, in women, the uterus, ovaries, and fallopian tubes. Pain in this area can originate from any of these structures.
Location Narrows the List
The lower abdomen is loosely divided into three zones: right side, left side, and center (just above the pubic bone). Each zone contains different organs, so the side your pain favors matters.
The right lower side holds your appendix, the beginning of the large intestine (the cecum), and part of the small intestine. In women, the right ovary and fallopian tube sit here too. Pain isolated to this spot raises concern for appendicitis, an ovarian cyst, or sometimes an inflamed pocket in the intestine.
The left lower side contains the descending and sigmoid colon, the end stretch of the large intestine where stool collects before a bowel movement. This is where diverticulitis typically strikes, and it’s also a common location for constipation-related cramping. The left ovary and fallopian tube are on this side as well.
Pain right in the center, low behind the pubic bone, usually points to the bladder or, in women, the uterus. A urinary tract infection, for example, often produces a dull pressure or discomfort in that suprapubic area along with burning during urination and the constant urge to go.
Common Digestive Causes
Constipation is one of the most frequent and least alarming reasons for lower abdominal pain. Stool backing up in the sigmoid colon creates cramping and bloating that can feel surprisingly intense. Increasing fiber, fluids, and movement usually resolves it within a day or two.
Gas and bloating can also concentrate in the lower abdomen, especially after eating foods that ferment easily in the gut. The pain tends to come in waves, shift locations, and improve after passing gas or having a bowel movement.
Irritable bowel syndrome (IBS) is a longer-term pattern. It’s diagnosed when you have recurrent abdominal pain at least one day per week over the past three months, with symptoms that started at least six months earlier. The pain is tied to bowel movements, either improving or worsening with them, and typically comes alongside changes in stool frequency or consistency. IBS doesn’t damage the intestine, but it can significantly affect daily life.
Diverticulitis happens when small pouches that form in the colon wall become inflamed or infected. It tends to cause steady, worsening pain on the lower left side, often with fever and changes in bowel habits. It’s more common after age 40 and sometimes requires antibiotics or, in severe cases, surgery.
Inflammatory bowel diseases like Crohn’s disease and ulcerative colitis cause chronic inflammation in the intestinal lining. Along with lower abdominal pain, they typically produce bloody stools, diarrhea, weight loss, and fatigue that persist for weeks.
Urinary Tract Causes
Bladder infections are a very common source of lower abdominal pressure, especially in women. The hallmarks are burning with urination, a frequent and urgent need to pee (often producing only small amounts), and a dull ache behind the pubic bone. These infections are usually straightforward to treat, but the symptoms overlap with several other conditions.
Pelvic floor dysfunction, bladder pain syndrome, and even ovarian cysts can all mimic a UTI because they produce urinary frequency, urgency, or discomfort. If you’ve been treated for a UTI and the pain keeps coming back, or if a urine test comes back negative, one of these conditions may be the actual cause.
Causes Specific to Women
Menstrual cramps are the most obvious explanation for cyclical lower abdominal pain in women, but several gynecological conditions cause pain that goes beyond normal period discomfort.
Ovarian cysts are fluid-filled sacs that form on the ovaries. Most are small, painless, and resolve on their own within a few menstrual cycles. Larger cysts can cause a dull ache or sharp pain on one side of the lower abdomen, difficulty with urination or bowel movements, and a feeling of fullness or pressure. A cyst that ruptures or twists (ovarian torsion) causes sudden, severe pain that needs emergency evaluation.
Endometriosis occurs when tissue similar to the uterine lining grows outside the uterus. It commonly causes pain with periods, pain during sex, pain with urination or bowel movements, and constipation. The pain often worsens over time and can show up at any point in the cycle, not just during menstruation.
Pelvic inflammatory disease (PID) is an infection of the reproductive organs, usually resulting from sexually transmitted bacteria. It produces lower abdominal pain along with abnormal discharge, painful or frequent urination, and sometimes fever. Untreated PID can lead to long-term complications including fertility problems.
Causes Specific to Men
Men can experience lower abdominal pain from testicular problems, even when the testicles themselves don’t seem to be the source. Pain from the testicles frequently radiates upward into the lower abdomen, so what feels like a stomach issue may actually originate below. Conditions like epididymitis (inflammation of the tube behind the testicle), testicular torsion, or an inguinal hernia can all present this way. Inguinal hernias, where tissue pushes through a weak spot in the groin muscles, are far more common in men and typically cause a dull ache in the lower abdomen that worsens with lifting, coughing, or straining.
When Pain Signals an Emergency
Appendicitis is the classic emergency in this region. In most people, appendicitis pain starts as a vague ache around the belly button and then migrates over several hours to the lower right side, where it becomes sharp and constant. Movement, coughing, or pressing on the area makes it worse. Appendicitis usually progresses quickly and requires surgery, so pain that follows this pattern warrants a trip to the emergency room.
Beyond appendicitis, seek immediate medical attention if your lower abdominal pain is accompanied by any of the following:
- Fever, which suggests infection or inflammation
- Bloody stools, which may indicate intestinal bleeding
- Persistent nausea and vomiting that won’t let up
- Severe tenderness when you touch your abdomen
- Visible swelling of the abdomen
- Unexplained weight loss
If the pain is severe and started after trauma, like a fall or car accident, or if you also feel pressure or pain in your chest, call 911.
Mild Pain That Lingers
Not all lower abdominal pain is urgent. Mild discomfort from gas, constipation, or menstrual cramps often responds to simple measures: a heating pad, gentle movement, over-the-counter pain relief, or dietary adjustments. If the pain is tolerable but sticks around for more than a few days, or if it keeps recurring in a pattern, schedule an appointment with your doctor. Chronic or recurring pain, even when it’s not severe, is worth investigating to rule out conditions like IBS, endometriosis, or inflammatory bowel disease that benefit from early management.