Severe lower abdominal pain has dozens of possible causes, ranging from trapped gas that will pass on its own to conditions like appendicitis that need emergency treatment. Where exactly the pain is, how suddenly it started, and what other symptoms you have are the biggest clues to what’s going on. Here’s what the most common causes look like and how to tell when something serious is happening.
Trapped Gas Can Feel Surprisingly Severe
One of the most common reasons for intense lower belly pain is also one of the least dangerous: trapped gas. When excess gas builds up in your intestines, it stretches the walls of your gut and can produce sharp, cramping pain that feels much worse than you’d expect. The pain often shifts location, comes in waves, and improves after you pass gas or have a bowel movement.
Gas builds up for a few predictable reasons. Swallowing extra air while eating quickly, talking during meals, chewing gum, or drinking through a straw all push air into your digestive tract. High-fiber foods, carbonated drinks, and dairy products (if you’re even mildly lactose intolerant) produce more gas during digestion. A digestive system that’s moving slowly, whether from medication, stress, or dehydration, gives gas more time to accumulate.
For relief, simethicone (the active ingredient in Gas-X) helps break up gas bubbles. Eating smaller, more frequent meals instead of large ones, cutting back on carbonated drinks, and chewing food slowly all reduce how much gas your body produces. If gas pain is a recurring problem, a low-FODMAP diet, which swaps hard-to-digest carbohydrates for easier alternatives, is one of the most evidence-backed approaches.
Where the Pain Is Matters
The location of your pain narrows the list of likely causes significantly.
Lower right side: Pain that starts near your belly button and migrates to the lower right is the classic pattern of appendicitis. Your appendix branches off from your large intestine on the right side, and when it becomes inflamed, the pain typically gets steadily worse over 12 to 24 hours. It often hurts more when you cough, walk, or press on the area and then release. This needs same-day medical evaluation.
Lower left side: Pain concentrated on the lower left often points to diverticulitis. Small pouches called diverticula develop in the colon wall, most commonly on the left side, and bacteria can get trapped in them, causing infection and inflammation. Diverticulitis typically produces constant, aching pain alongside fever, nausea, or changes in bowel habits. It’s most common after age 40 but can happen earlier.
One side only: Pain isolated to one side may involve a kidney stone or, in women, an ovarian cyst. Kidney stones usually cause pain that radiates from the back around to the lower abdomen and groin, often with an urgent need to urinate. Ovarian cysts can produce sudden, sharp pain on one side if they rupture or twist.
Causes Specific to Women
The lower abdomen houses the uterus, ovaries, and fallopian tubes, which means women have several additional causes to consider. Menstrual cramps are the most obvious, but pain that’s significantly worse than your normal period pain or that occurs outside your cycle deserves attention.
Ovulation pain (sometimes called mittelschmerz) affects one side at a time, around the midpoint of your cycle, and usually lasts a few hours to a day or two. Endometriosis, where tissue similar to the uterine lining grows outside the uterus, causes chronic lower pelvic pain that often worsens during periods. An ectopic pregnancy, where a fertilized egg implants outside the uterus, causes sharp lower abdominal pain and is a medical emergency. For any woman of reproductive age with acute lower abdominal pain, a pregnancy test is one of the first steps in evaluation, even before imaging.
Causes Specific to Men
Inguinal hernias are far more common in men, occurring 8 to 10 times more often than in women. These happen when part of the intestine or abdominal lining pushes through a weak spot in the inguinal canal, the passage in the groin that carries the spermatic cord. You might feel a dull ache or pressure in the lower abdomen that worsens with lifting, coughing, or standing for long periods. Larger hernias can extend into the scrotum, causing visible swelling alongside the pain.
Prostatitis, or inflammation of the prostate, can also produce deep lower abdominal and pelvic pain in men, often accompanied by difficulty urinating, a frequent urge to urinate, or pain during urination.
Bladder and Urinary Tract Pain
A urinary tract infection is one of the most common causes of lower abdominal pressure and pain, particularly in women. The pain sits low, right above the pubic bone, and usually comes with burning during urination and a constant urge to go even when your bladder is nearly empty.
If those symptoms keep recurring without a detectable infection, the cause may be interstitial cystitis, also called bladder pain syndrome. This condition produces symptoms that mimic a UTI (pelvic pressure, urgent and frequent urination, pain while urinating) but no bacteria show up on testing. The pain can range from mild discomfort to severe, and it tends to be chronic, with flare-ups that last days or weeks.
Chronic or Recurring Lower Belly Pain
If your lower abdominal pain keeps coming back over weeks or months, irritable bowel syndrome is one of the most likely explanations. IBS is diagnosed when you have recurrent abdominal pain at least one day per week for three months, and the pain is linked to bowel movements, changes in how often you go, or changes in stool consistency (looser, harder, or both). Symptoms need to have been present for at least six months before a formal diagnosis is made.
IBS pain tends to be crampy, often improves after a bowel movement, and can shift between the lower left and lower right abdomen. Stress, certain foods, hormonal changes, and disrupted sleep commonly trigger flare-ups. It’s not dangerous, but it can be genuinely debilitating, and it responds well to dietary changes like the low-FODMAP approach, stress management, and specific medications your provider can recommend based on your symptom pattern.
Warning Signs That Need Immediate Attention
Most lower abdominal pain resolves on its own or with straightforward treatment. But certain combinations of symptoms signal conditions that can become life-threatening without prompt care. Get to an emergency room if your pain is accompanied by any of the following:
- Sudden, excruciating onset: Pain that goes from zero to severe in seconds or minutes can indicate a ruptured organ, a burst cyst, or a blocked blood vessel supplying the intestines.
- Fever with worsening pain: This combination suggests infection or inflammation that may be spreading, such as a ruptured appendix or severe diverticulitis.
- Rebound tenderness: If pressing on your abdomen and releasing hurts more than the pressing itself, or if coughing sharply increases the pain, the lining of your abdominal cavity may be inflamed. This is a surgical red flag.
- Inability to pass gas or have a bowel movement: Combined with bloating and vomiting, this pattern suggests a bowel obstruction.
- Rapid heart rate, dizziness, or fainting: These suggest internal bleeding or a serious drop in blood pressure.
What Happens at the Doctor’s Office
If your pain is severe enough to seek care but not an emergency, expect a physical exam focused on where exactly it hurts and what makes it worse. For acute pain in the lower right or left abdomen, a CT scan is the standard first imaging study because it can identify appendicitis, diverticulitis, kidney stones, and many other causes quickly. For women of reproductive age, a pelvic ultrasound is typically used instead when a gynecologic cause or pregnancy is suspected.
Blood tests look for signs of infection or inflammation, and a urine test can quickly rule in or out a urinary tract infection or kidney stone. The combination of your pain’s location, timing, associated symptoms, and these basic tests is usually enough to identify the cause or at least narrow it to a short list.