You lace up your shoes, ready for a brisk walk or a heart-pumping workout. But halfway through, a sharp or dull ache sets in right in your stomach area. Suddenly, your focus shifts from crushing your fitness goals to wondering, “What is going on in there?”

Stomach pain during physical activity can range from harmless to a signal that something more serious is at play. Knowing the difference can help you respond the right way—whether that means slowing down, changing your habits, or calling your doctor.

Common Causes of Stomach Pain During Activity

1. Side Stitches
   One of the most frequent culprits is the infamous side stitch—a cramp that hits just under the ribs. This happens when your diaphragm (the muscle that helps you breathe) gets irritated, often from breathing too shallowly or eating right before exercise. The fix? Slow down, take deeper breaths, and give your body a break.
2. Digestive Upset
   That burrito you had an hour before your workout might come back to haunt you. Heavy or greasy meals can cause cramping, bloating, or nausea during activity because your digestive system and muscles are competing for blood flow.
3. Muscle Strain
   Your core muscles are working harder than you think when you walk briskly or exercise. Overstretching or sudden twisting can strain them, leading to pain that might feel like it’s coming from deep inside.

When Pain Signals Something More Serious

Most exercise-related stomach pain is temporary and harmless, but some cases call for closer attention. Persistent or worsening pain could indicate:

• Gallbladder or appendix issues

• Hernias

• Ulcers or severe inflammation

Sometimes, stomach pain isn’t even about your stomach—it can be referred pain from another part of your body. Just like noticing pus in stitches after surgery tells you there’s an infection, unusual or worsening abdominal pain should make you pause and investigate.

Prevention Tips That Actually Work

1. Time Your Meals
   Aim to eat at least 1–2 hours before exercising, and choose lighter meals if you’re working out soon after eating.
2. Warm Up Properly
   A good warm-up increases blood flow and preps your muscles (including your core) for movement.
3. Stay Hydrated
   Both dehydration and overhydration can cause cramps. Sip water throughout the day instead of chugging right before your workout.
4. Breathe with Intention
   Focus on steady, deep breaths during exercise to reduce your risk of side stitches.

When to See a Doctor

Seek medical advice if your stomach pain:

• Is severe or comes on suddenly

• Doesn’t go away with rest

• Comes with fever, vomiting, or blood in stool

• Interferes with daily life or keeps you from normal activities

Bottom Line

Stomach pain during walking or exercise is often just your body’s way of saying, “Slow down, adjust, and take care of me.” But it can also be a red flag. Listen to your body, make adjustments to your routine, and don’t hesitate to seek medical help if something feels off. Your health—and your workouts—will benefit in the long run.