Pain in your lower stomach, the area below your belly button, is most often caused by something happening in your intestines. Your small and large intestines take up most of the space in your lower abdominal cavity, so digestive issues like gas, constipation, and indigestion are the most common culprits. But depending on where exactly the pain sits, how it feels, and what other symptoms come with it, the cause could also involve your bladder, reproductive organs, or appendix.
Gas, Constipation, and Everyday Digestive Causes
The most likely explanation for lower stomach pain is also the least worrying. Trapped gas can create surprisingly sharp, intense pain that moves around your abdomen and then disappears once the gas passes. Constipation builds pressure in your colon, producing a dull, crampy ache that often settles in the lower left side, since that’s where your colon makes its final turn before the rectum. Diarrhea and general indigestion can cause widespread lower abdominal cramping that comes in waves.
If gas pain is a recurring problem, a few changes can help. Eating smaller portions of gas-producing foods, cutting back on carbonated drinks, and reducing fried or fatty foods all lower gas production. Fatty foods in particular slow the clearance of gas from your intestines, making bloating linger. Regular exercise helps too, mainly by preventing constipation, which traps gas in your colon. Over-the-counter options include simethicone (sold as Gas-X), which breaks up gas bubbles so they pass more easily, and lactase supplements if dairy tends to set you off.
Irritable Bowel Syndrome
If your lower stomach pain keeps coming back over weeks or months, sometimes with diarrhea, sometimes with constipation, and often with bloating, irritable bowel syndrome (IBS) is a strong possibility. IBS is a chronic condition where the intestines are overly sensitive and reactive. The pain is typically crampy, comes and goes rather than staying constant, and often improves after a bowel movement. It doesn’t cause progressive damage, but it can significantly affect daily life. A doctor can diagnose IBS based on your symptom pattern, usually after ruling out other conditions.
Diverticulitis
Pain specifically in your lower left abdomen, especially if it’s steady rather than crampy and comes with fever or a change in bowel habits, could point to diverticulitis. Small pouches called diverticula can form in the colon wall, most commonly on the lower left side. These pouches are great hiding places for bacteria, and when they become infected or inflamed, the result is a focused, persistent pain that worsens over a day or two. Diverticulitis is more common after age 40 and typically needs medical treatment.
Appendicitis
Lower right abdominal pain has a specific red flag: appendicitis. The classic pattern starts as a vague ache around your belly button that may hover or come and go for several hours. Then nausea and vomiting develop. After the nausea passes, the pain shifts to your lower right abdomen, becomes more focused, and continues to worsen. If the inflamed appendix bursts, infection can spread to the lining of your abdominal cavity, which is a surgical emergency. Pain that follows this belly-button-to-lower-right pattern, especially with fever, warrants an ER visit.
Bladder and Urinary Tract Infections
A dull pressure or discomfort in your lower abdomen, paired with urinary symptoms, often means your bladder is involved. Bladder infections cause a burning sensation when you urinate, frequent or intense urges to go even when your bladder is nearly empty, and sometimes cloudy, bloody, or strong-smelling urine. The lower abdominal pain from a UTI tends to feel like pressure rather than sharp pain, and it sits centrally, right above your pubic bone. UTIs are far more common in women but can affect anyone.
Reproductive Causes in Women
For women, the lower abdomen houses the uterus and ovaries, which adds a whole category of possible causes. Menstrual cramps are the most obvious, but persistent or severe pelvic pain can signal something else. Ovarian cysts can cause a sudden, sharp pain on one side if they rupture, or a dull ache if they’re growing. Endometriosis, where tissue similar to the uterine lining grows outside the uterus, produces chronic pain that often worsens during periods. Pelvic inflammatory disease (PID), usually from an untreated sexually transmitted infection, causes lower abdominal pain with unusual discharge and sometimes fever.
An ectopic pregnancy, where a fertilized egg implants outside the uterus, causes sharp lower abdominal pain that can become a medical emergency. Any sudden, severe pelvic pain with missed periods or abnormal bleeding needs immediate attention. Doctors typically use ultrasound, blood tests, and urine tests to sort through these possibilities.
Reproductive Causes in Men
Men experiencing lower abdominal pain, especially with groin, genital, or lower back pain, may be dealing with prostatitis. Chronic prostatitis causes pain lasting three months or more in the central lower abdomen, between the scrotum and anus, or in the lower back. Pain during or after ejaculation is another hallmark. Acute bacterial prostatitis comes on faster, with more intense pain, fever, and urinary difficulty. Testicular problems like torsion or infection can also send referred pain into the lower abdomen.
What the Type of Pain Tells You
The character of your pain narrows down the possibilities. Crampy pain that comes in waves usually points to your intestines, whether from gas, constipation, IBS, or a stomach bug. Steady, worsening pain that doesn’t let up is more concerning and suggests inflammation, as in appendicitis or diverticulitis. A dull pressure or ache is more typical of bladder issues or reproductive causes. Sharp, sudden pain on one side raises the possibility of an ovarian cyst rupture, kidney stone, or testicular torsion.
How long the pain lasts matters too. Pain that develops and resolves within hours to days is considered acute and usually has a specific, treatable cause. Pain that comes and goes for weeks to months is chronic, and conditions like IBS, endometriosis, or chronic prostatitis become more likely.
Signs You Need Emergency Care
Most lower stomach pain resolves on its own or with simple treatment, but certain combinations of symptoms require an ER visit. Get emergency care if your pain comes with vomiting blood, black or bloody stool, blood in your urine, a swollen and tender abdomen, persistent vomiting, high fever, or shortness of breath and dizziness. Pain that started after an injury or that radiates into your chest, neck, or shoulder also needs immediate evaluation. Lower right pain following the belly-button-to-right-side pattern of appendicitis shouldn’t wait for a scheduled appointment.