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5 Weird Workout Side Effects

Pushing through a little pain is one thing, but if you’re plagued by these symtoms, listen up. Your body might be trying to tell you something.

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Sweat, muscle failure and the pain of lactic acid build-up are what you might expect from a good workout. Heck, you might even welcome them. Dizziness, heartburn and a side pain that stops you in your tracks, on the other hand, can definitely put a damper on your motivation to stick with your exercise plan. But beyond that, should you worry? Here experts discuss weird workout side effects, what your body may be trying to tell you—and when to schedule a doctor's appointment pronto.

Side Effect #1: Shakiness

After doing your usual squat routine, your trainer decides to mix in single-leg squats, and your first attempt makes your leg muscles shake as if you've been shot with a taser. What gives? It could be a number of things, says Keith Veselik, MD, director of primary care at Loyola University Health System in Chicago. "Often muscles shakiness is simply due to fatigue. You're likely pushing it to the point where you're maxed out."

Your blood sugar may also be low, says John P. Higgins, MD, director of exercise physiology at the Ironman Sports Medicine Institute at Memorial Hermann-Texas Medical Center. Hypoglycemia (low blood glucose) can cause symptoms ranging from tremors to fatigue, and even loss of consciousness, says Higgins.

How to reduce your risk: Eat before you exercise to avoid a drop in blood sugar. Think protein and carbs, like whole-wheat toast with peanut butter or half of an energy bar, suggests Veselik. And if it lasts for longer than a few hours, see a doctor.

NEXT: Dizziness and Nausea

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