Lower abdominal pain has dozens of possible causes, ranging from something as simple as trapped gas or a pulled muscle 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. Here’s a practical breakdown of the most common reasons your lower belly might be hurting.
The Most Common Everyday Causes
For many people, lower abdominal pain turns out to be something temporary and digestive. Constipation is one of the top culprits, especially if you haven’t had a bowel movement in a few days. Stool building up in the colon creates pressure and cramping that tends to settle in the lower left side, since that’s where the last stretch of your large intestine sits. Gas and bloating can cause similar discomfort anywhere across the lower belly, often with a feeling of fullness or visible swelling.
Stomach bugs and food-related illness also cause lower abdominal cramping, usually alongside diarrhea, nausea, or vomiting. This type of pain is typically diffuse (spread across the whole lower area rather than pinpointed to one spot) and resolves within a day or two.
When Location Matters: Right Side vs. Left Side
If you can point to a specific side, that narrows the possibilities significantly.
Pain in the lower right is the classic location for appendicitis, which affects roughly 8 to 10 percent of people at some point in their lives. A hallmark pattern is pain that starts vaguely around the belly button, then migrates to the lower right over several hours, often accompanied by loss of appetite, nausea, or a low fever. The area becomes increasingly tender to the touch. Appendicitis pain typically gets worse with movement, coughing, or pressing on the spot and then releasing.
Pain in the lower left points more often toward diverticulitis, which happens when small pouches in the colon wall become inflamed or infected. It’s more common in adults over 40 and usually brings a steady, aching pain on the left side along with fever, nausea, or changes in bowel habits. Other left-sided causes include inflammatory bowel disease (like ulcerative colitis) and infectious colitis.
Urinary Tract Problems
Urinary tract infections are a frequent cause of lower abdominal pain, particularly in women. The pain tends to sit low, near the pubic bone, and comes with a burning sensation during urination, a constant urge to go, or cloudy urine. Kidney stones produce a different kind of pain: sharp, stabbing, and usually felt more in the back or side of the lower torso, though it can radiate into the groin. Kidney stone pain often comes in waves and can be severe enough to make it hard to sit still.
If you’re feeling burning when you urinate along with lower belly pressure, a UTI is the more likely explanation. If the pain is intense, one-sided, and comes with no relief in any position, kidney stones are higher on the list.
Causes Specific to Women
The reproductive organs sit in the lower abdomen, so several gynecological conditions show up as pain in this area.
Ovarian cysts are one of the most common causes of sudden lower abdominal pain in younger women. Functional cysts form naturally during the menstrual cycle and usually dissolve on their own, but if one bleeds or ruptures, it can cause sharp, one-sided pain that comes on quickly. In most cases the pain is manageable, but severe bleeding from a ruptured cyst occasionally requires emergency treatment.
Pelvic inflammatory disease (PID) typically affects sexually active women and results from bacterial infections that spread to the uterus, fallopian tubes, or ovaries. Symptoms range widely, from mild lower belly discomfort with unusual discharge to significant pain with fever and pain during sex. PID is treatable with antibiotics but can cause long-term problems if ignored.
Ectopic pregnancy, where a fertilized egg implants outside the uterus (usually in a fallopian tube), is a medical emergency. It causes lower abdominal pain that’s often one-sided, along with vaginal bleeding, and typically becomes dangerous between 10 and 14 weeks. Any lower abdominal pain with a missed period or positive pregnancy test warrants immediate evaluation.
Endometriosis and uterine fibroids are longer-term conditions that cause recurring lower belly pain, often linked to the menstrual cycle. Mittelschmerz, the brief, sharp pain some women feel during ovulation, is harmless and usually resolves within hours.
Causes Specific to Men
Inguinal hernias are far more common in men and occur when a portion of the small intestine pushes through a weak spot in the lower abdominal wall. This creates a visible or palpable lump near the groin that may ache or burn, especially when lifting, coughing, or straining. The discomfort can spread from the groin into the lower abdomen. Surgery is the only permanent fix.
Testicular torsion, where a testicle twists on its blood supply, causes sudden severe pain in the scrotum that often radiates upward into the lower belly. It requires emergency treatment within hours to save the testicle. Prostatitis, inflammation of the prostate gland, produces a duller lower abdominal or pelvic ache along with painful urination, fever, or discomfort in the rectum.
Could It Be IBS or Inflammatory Bowel Disease?
If your lower abdominal pain keeps coming back over weeks or months, two conditions worth understanding are irritable bowel syndrome (IBS) and inflammatory bowel disease (IBD). They sound similar but are fundamentally different.
IBS causes abdominal pain and cramping tied to bowel habits: diarrhea, constipation, or an alternating mix of both. It doesn’t damage the intestine. Pain often improves after a bowel movement and may flare with stress or certain foods. IBD, which includes Crohn’s disease and ulcerative colitis, involves actual inflammation and damage to the digestive tract. It causes similar cramping and diarrhea but also produces bloody stools, fevers, and weight loss. If you’re seeing blood in your stool or losing weight without trying, that distinction matters and points toward IBD rather than IBS.
Muscle Strain: A Cause People Overlook
Not all lower abdominal pain comes from inside the body. A strained abdominal muscle can mimic internal problems convincingly. The key difference is that muscle pain gets worse when you change positions, sit up, cough, or tense your core, and it tends to stay in one specific spot you can press on. It doesn’t come with digestive or urinary symptoms like nausea, changes in bowel habits, or burning during urination. If your pain started after exercise, heavy lifting, or an awkward movement, and it sharpens when you flex your stomach muscles, a strain is the likely cause.
Red Flags That Need Quick Attention
Most lower abdominal pain resolves on its own or with simple treatment. But certain combinations of symptoms signal something more urgent:
- Blood in your stool or black, tarry stools
- A rigid, swollen abdomen that’s painful to touch
- Persistent fever alongside the pain
- No bowel movement for several days with worsening pain or bloating
- Nausea and vomiting that won’t stop
- Severe pain that came on suddenly and keeps getting worse
- Pain with a positive pregnancy test
What Happens During Evaluation
If your pain is severe enough or persistent enough to see a provider, the workup depends heavily on your age, sex, and symptoms. For general or unclear abdominal pain, a CT scan of the abdomen and pelvis is the go-to imaging tool because it can visualize most organs at once. For women of childbearing age, ultrasound (either external or transvaginal) is the preferred first step when a gynecological cause is suspected. For pregnant patients, MRI is typically used instead of CT to avoid radiation. Kidney stones can often be caught with ultrasound first in younger patients, though CT is more definitive for older adults or unusual presentations.
In many cases, though, your description of the pain, its exact location, what makes it better or worse, and your other symptoms will point strongly toward a diagnosis before any imaging is ordered.