Is It OK to Work Out When You're Sick? Here's How to Tell

Some die-hards like to boast that they never, ever skip a workout even when they're not feeling 100 percent. That's some serious dedication! But it's not always advisable. Though there are some cases when exercising under the weather is OK, chances are, it's best to take a rest day (or two).

If you're not feeling well, chances are you should skip the gym.
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Exercise has plenty of health benefits, but if you're fighting an illness, your body needs time to recover properly. And if you push yourself too hard in the gym, you may even prolong the time it takes to get better. So should you suck it up or throw in the towel? You'll need to consider your symptoms first.

Read more: 4 Surprising Health Benefits of Getting the Flu Shot (Beyond Not Getting the Flu)

How to Decide if You Should Hit the Gym or Hit the Hay

Your decision to exercise when you're feeling under the weather depends on what symptoms you're experiencing and their severity. First, assess how you're feeling overall. If you feel like you need a rest day, take it! Just like one workout won't give you six-pack abs, skipping one or two gym sessions won't set you back that much.

Illness can lead to fatigue or dehydration — two big things to look out for when weighing the decision to work out, as exercise can make these symptoms worse, says Cynthia Li, MD, who owns a private practice in integrative and functional medicine. While fatigue and dehydration may not be severe, they may be signs you should skip your workout, she says.

Generally, though, if your symptoms are "above the neck," like a runny nose or sore throat, you're okay to exercise, according to the Mayo Clinic. However, if you feel "below the neck" symptoms like chest congestion, coughing or upset stomach, you'll want to skip the gym. Other symptoms like fever or muscle aches mean you should probably skip your workout.

Still not sure? Consider Dr. Li's advice for some common ailments:

If You Have a Cold

Generally, Dr. Li advises against exercising with a cold, instead prioritizing rest to conserve energy and recuperate as quickly and efficiently as possible. However, it's generally not dangerous to exercise with a cold if your symptoms are limited to your eyes, nose and throat. Bottom line: Listen to your body. If you don't feel well enough to exercise, don't.

If You Have the Flu

Typically the flu is accompanied by a fever or feverish chills, muscle or body aches and (for some people) digestive unrest, according to the Centers for Disease Control and Prevention. While most people will recover in a few days, it's important to give your body plenty of rest, as the flu can develop into other conditions, like pneumonia, if it persists.

"Someone with the full-blown flu usually finds it challenging to walk to the bathroom, so I think it's highly unlikely she or he would consider exercising," says Dr. Li.

Read more: Should You Exercise When You Have the Flu?

If You Have a Stomach Bug

Usually, a stomach bug indicates your digestive system is, shall we say, disturbed, which means you're probably losing a lot of fluids, according to the Mayo Clinic. In some cases, a stomach flu may also come with a fever and muscle ache.

Considering the potential for dehydration, you'll definitely want to skip your workout if you're dealing with a stomach bug, Dr. Li says. Especially if you're experiencing a lot of vomiting or diarrhea, you'll want to be wary of your hydration levels and see the doctor one to three days after infection (or the onset of symptoms).

If You Have a Respiratory Condition

If you're dealing with a respiratory infection in your chest, Dr. Li recommends avoiding exercise until your cough and congestion completely subside before going back to the gym. Respiratory infections can make breathing difficult, which can be especially taxing if you're planning get your heart rate up with some exercise.

Adjust Your Workout Accordingly

Although rest should be the main priority if you're not feeling well, if you still plan on going to the gym, you'll want to adjust your workout, says Dr. Li. Dial down the intensity and length of your workout. Instead of going for a run, bring your pace down or opt for a walk. Avoid intense intervals and keep your workout short.

Also, be considerate of your fellow gym-goers. Wash your hands regularly, wipe down your machines and use a personal water bottle instead of the water fountain. Though you really shouldn't exercise if you're contagious (it's not fair to everyone else), even these small measures can help prevent the spread of germs.

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