Lower stomach pain has dozens of possible causes, ranging from trapped gas and constipation to conditions that need prompt medical attention like appendicitis. 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 parts of your large intestine, your bladder and ureters, and (depending on your sex) reproductive organs like the ovaries and uterus or the spermatic cords and prostate.
What the Type of Pain Tells You
Not all abdominal pain works the same way. When an internal organ stretches or spasms, the pain tends to feel vague, dull, and hard to pinpoint. It often shows up in the middle of your abdomen even if the organ causing it sits off to one side. This is why early appendicitis frequently starts as a general ache around the belly button before it sharpens and moves to the lower right. If the pain is crampy and comes in waves, that’s often a sign of something muscular in your intestines, like the contractions that push food (or gas) along.
Sharp, well-localized pain that gets worse when you move, cough, or press on the area usually means the lining of your abdominal cavity is irritated. This kind of pain is more concerning because it can signal inflammation or infection that has spread beyond the organ itself.
Gas, Constipation, and Food Intolerances
The most common reasons for lower abdominal discomfort are also the least dangerous. Bacteria in your large intestine break down carbohydrates that your stomach and small intestine couldn’t fully digest, and they produce gas in the process. When that gas gets trapped or builds up, it causes bloating, cramping, and sometimes surprisingly sharp pain in the lower abdomen. The pain typically shifts around and eases after you pass gas or have a bowel movement.
Constipation creates a similar picture. Stool backed up in the colon stretches the intestinal walls and triggers cramping, particularly in the lower left side where the sigmoid colon curves down toward the rectum. If you haven’t had a bowel movement in a few days and the pain feels like pressure or fullness, this is a likely explanation.
Food intolerances are another frequent culprit. Lactose intolerance and fructose intolerance both cause bloating, abdominal pain, and diarrhea after eating trigger foods. The pattern is usually predictable: pain shows up within a few hours of consuming dairy, fruit juice, honey, or other high-fructose foods. Functional conditions like irritable bowel syndrome (IBS) can amplify all of these symptoms because of altered communication between the brain and the gut, making you more sensitive to normal amounts of gas and intestinal movement.
Right Side: Appendicitis and Related Causes
Pain that settles in the lower right part of your abdomen is the hallmark of appendicitis. The classic pattern starts as a vague ache around the belly button, then migrates to the lower right over 12 to 24 hours, becoming sharper and more constant. Loss of appetite, nausea, vomiting, and a low-grade fever often come along with it. Nearly one in four people with appendicitis won’t have elevated white blood cell counts on a blood test, so normal lab results alone don’t rule it out.
Other conditions can mimic this same location. Inflammation of the large intestine (colitis), Crohn’s disease, and even kidney stones passing through the right ureter all produce right lower quadrant pain. In women, an ovarian cyst that ruptures or an ovary that twists on its blood supply (ovarian torsion) can cause sudden, intense pain on either side of the lower abdomen.
Left Side: Diverticulitis and Bowel Problems
Diverticulitis is the most common cause of acute pain in the lower left abdomen in adults. Small pouches (diverticula) form along the wall of the colon over time, and about 10 to 20 percent of people who develop these pouches will eventually have an episode of inflammation or infection. The condition becomes more common with age: roughly 5 to 10 percent of people have diverticula by age 45, but up to 80 percent do by age 80. The typical presentation is left-sided pain accompanied by fever, and it tends to come on gradually over a day or two.
Constipation, infectious colitis, inflammatory bowel disease, and an incarcerated hernia (where part of the intestine gets trapped in a weak spot in the abdominal wall) can also cause pain on the left side.
Urinary Tract Causes
A bladder infection produces pain or discomfort in the lower abdomen, centered just above the pubic bone. You’ll typically also notice a burning sensation when you urinate, a frequent urgent need to go, and sometimes cloudy or strong-smelling urine. Bladder infections are far more common in women than men, but they can affect anyone.
Kidney stones that have moved from the kidney down into the ureter cause a different kind of pain: intense, wave-like cramping that can radiate from the back around to the lower abdomen and into the groin. The pain comes and goes as the ureter contracts to push the stone along, and it’s often described as one of the most severe pains people experience.
Causes Specific to Women
The ovaries, fallopian tubes, and uterus sit in the lower abdomen, so gynecological conditions are a frequent source of pain in this area. Ovarian cysts are fluid-filled sacs that form on the ovaries. Most are harmless and resolve on their own, but a cyst that ruptures or grows large enough to twist the ovary can cause sudden, sharp pain on one side.
Endometriosis, where tissue similar to the uterine lining grows outside the uterus, causes chronic lower abdominal and pelvic pain that often worsens around menstruation. Pelvic inflammatory disease (PID), an infection of the reproductive organs usually linked to sexually transmitted bacteria, produces pain on both sides of the lower abdomen along with unusual discharge, fever, and pain during intercourse.
An ectopic pregnancy, where a fertilized egg implants outside the uterus (usually in a fallopian tube), causes severe one-sided lower abdominal pain and vaginal bleeding. This is a medical emergency that requires immediate treatment.
Causes Specific to Men
Inguinal hernias are more common in men and happen when a portion of the small intestine bulges through a weak spot in the lower abdominal wall, creating a painful or tender lump in the groin area. The pain may be intermittent and worsen with lifting, coughing, or straining.
Prostatitis, or inflammation of the prostate gland, can cause lower abdominal pain along with difficulty urinating, pain in the rectum, fever, and chills. Testicular torsion, where a testicle twists on its blood supply, produces sudden and severe pain in the groin that radiates up into the lower abdomen. The scrotum may swell, and the pain typically comes on without warning. This is a time-sensitive emergency because the blood supply to the testicle can be permanently cut off.
When Lower Stomach Pain Is an Emergency
Most lower abdominal pain resolves on its own or with simple measures. But certain patterns require immediate care:
- Sudden, severe pain that doesn’t ease within 30 minutes
- Pain with continuous vomiting, which may indicate a bowel obstruction or other serious condition
- Pain with high fever and chills, suggesting infection
- Pain with vaginal bleeding in someone who could be pregnant, which raises concern for ectopic pregnancy
- A rigid, board-like abdomen that is extremely tender to touch
- Sudden testicular pain, which may signal torsion
For appendicitis specifically, the combination of pain migrating from around the belly button to the lower right abdomen, loss of appetite, nausea, and low-grade fever is the pattern that matters most. Pain that worsens when you cough, hop, or press and release the area quickly suggests the abdominal lining is inflamed, which typically means something needs treatment sooner rather than later.