Side pain has dozens of possible causes, and the fastest way to get rid of it depends entirely on what’s behind it. The most common culprits are trapped gas, muscle strain, exercise-related stitches, and kidney issues, but pain location, timing, and accompanying symptoms all matter. Here’s how to narrow down what’s going on and find relief.
Where Exactly Is the Pain?
The organs packed into each side of your torso are different, so location is your first clue. Pain in the upper right side often traces back to the liver, gallbladder, or bile ducts. Upper left pain can involve the stomach, spleen, or pancreas. Lower right pain raises concern about the appendix, while lower left pain is frequently related to the colon. Pain that wraps around your flank (the area between your ribs and hip toward your back) often points to a kidney problem.
For people who menstruate, lower side pain has additional possibilities. Ovulation pain, called mittelschmerz, strikes on one side of the lower abdomen about 14 days before your next period. It typically lasts a few minutes to a few hours, though it can stretch to a day or two. The side can alternate month to month because it follows whichever ovary releases an egg. If you track your cycle and notice the pain always lands mid-cycle, that’s likely the explanation. Ovarian cysts, endometriosis, and pelvic inflammatory disease can also cause one-sided lower pain and tend to follow different patterns.
Gas Pain: The Most Common Cause
Trapped gas is one of the most frequent reasons for sharp, stabbing side pain, and it can be surprisingly intense. Gas filling up the small or large intestine creates pressure that mimics more serious conditions. The pain often shifts location, comes in waves, and improves after passing gas or having a bowel movement.
To move trapped gas along, try the wind-relieving pose: lie on your back, inhale, and hug both knees to your chest as you exhale. Rock your knees gently side to side and hold for 5 to 10 breaths. Repeat a few times. A spinal twist also helps. From the same position, drop both knees to your left side, using your left hand to press them down gently while stretching your right arm out to the side. Hold for 5 to 10 breaths, then switch sides. These positions stretch and compress the abdominal organs in a way that encourages gas to pass.
Over-the-counter gas relief tablets containing simethicone work by breaking up gas bubbles in your digestive tract. The standard adult dose is 40 to 125 mg taken four times a day, after meals and at bedtime, with a maximum of 500 mg in 24 hours. Taking it after eating rather than before gives the best results.
Exercise-Related Side Stitches
A side stitch during running or other cardio is a sharp, cramping pain just below the ribs, usually on the right. Scientists still aren’t certain what causes it, though one leading theory points to irritation of the membrane lining the inside of the abdominal cavity. It’s more common when you eat or drink heavily before exercise, ramp up intensity too quickly, or breathe shallowly.
To stop a stitch mid-workout, slow your pace, take a deep breath in, then exhale slowly and fully. Repeat several times. Pressing your fingers gently into the painful spot while exhaling can also help. Some runners find that syncing their exhale with the footstrike on the opposite side of the pain breaks the cycle. To prevent stitches in the future, avoid large meals within two hours of exercise, warm up gradually, and practice belly breathing rather than chest breathing during activity.
Muscle Strain Along the Ribs
The intercostal muscles sit between your ribs, and straining them produces sharp pain that worsens when you twist, cough, sneeze, or take a deep breath. This commonly happens from sudden twisting movements, heavy lifting, or even prolonged coughing during a cold. The pain tends to be very localized, and you can often reproduce it by pressing on the exact spot.
Mild strains heal within a few days. Moderate strains, where more muscle fibers are torn, take 3 to 7 weeks. Most rib-area muscle injuries resolve within 6 weeks. In the meantime, over-the-counter acetaminophen or ibuprofen can take the edge off. Ice the area for 15 to 20 minutes at a time during the first couple of days, then switch to heat. Avoid stretching the injured area unless a physical therapist guides you, because pushing too early can worsen the tear. Once the acute pain settles, gentle side bends and deep breathing exercises help rebuild strength and flexibility.
Kidney Stones and Flank Pain
Kidney stone pain is distinctive. It typically hits your flank (the side of your back between your lower ribs and hip) and can radiate around to your lower abdomen and groin. The pain comes in intense waves, often accompanied by nausea, and you may notice pink, red, or brown urine. It’s sometimes described as the worst pain a person has experienced.
Small stones can pass on their own with aggressive hydration. The Mayo Clinic recommends drinking 1.8 to 3.6 liters (roughly 2 to 3 quarts) of fluid per day to keep urine dilute and help flush the stone through. Your doctor may prescribe a medication called an alpha blocker, which relaxes the muscles in the tube connecting your kidney to your bladder, helping the stone pass more quickly and with less pain. Stones too large to pass naturally may need procedures to break them up or remove them. If you suspect a kidney stone, getting it confirmed with imaging is important because treatment depends on the stone’s size and location.
Gallbladder Attacks
Gallbladder pain typically strikes the upper right abdomen, sometimes radiating to the right shoulder blade or center of the chest. It often flares after eating fatty or heavy meals and produces a deep, squeezing ache that can last from minutes to hours. Gallstones are the usual cause, and attacks tend to recur.
Dietary changes can reduce the frequency of attacks. The main triggers to cut back on include fried foods, butter and lard, full-fat dairy, red and processed meats (bacon, deli meats, hot dogs), sugary drinks, and ultra-processed snacks like pastries and crackers. Shifting toward lean proteins, vegetables, fruits, and whole grains gives the gallbladder less work to do. If attacks become frequent or severe, surgical removal of the gallbladder is one of the most common abdominal surgeries and typically involves a short recovery.
Appendicitis: Pain That Demands Urgency
Appendicitis starts with a vague ache around the belly button that, over several hours, migrates to the lower right abdomen. The pain steadily worsens rather than coming and going, and it’s often accompanied by nausea, loss of appetite, and low-grade fever. A classic diagnostic landmark is McBurney’s point, located about two inches along an imaginary line drawn from the bony hip projection to the belly button, roughly one-third of the way. Tenderness there is a strong signal.
Appendicitis is always an emergency. If you have worsening lower right abdominal pain, especially with nausea, fever, or increasing tenderness when you press on the area, get to an emergency room. A ruptured appendix can become life-threatening within hours.
Red Flags That Need Immediate Attention
Most side pain turns out to be something manageable, but certain combinations of symptoms signal a trip to the ER rather than a wait-and-see approach. Seek immediate care if your side pain comes with any of the following:
- Fever of 102°F or higher
- Severe pain that’s rapidly getting worse
- Chest pain or shortness of breath
- Blood in your urine or stool
- Vomiting that won’t stop
- Dizziness, confusion, or feeling faint
- Abdominal rigidity, where your stomach muscles feel hard and board-like
Side pain that’s mild, comes and goes, and improves with simple measures like repositioning, passing gas, or over-the-counter pain relief is usually safe to monitor at home for a day or two. Pain that’s constant, escalating, or paired with the symptoms above needs professional evaluation. When in doubt, the severity and trajectory of the pain matter more than the pain itself. Getting worse is always more concerning than holding steady.