9 signs your workout may be hurting you

Jasmine Marcus, a New York-based physical therapist, told BI why pain during your workouts is a recipe for disaster.

"Pain is your body's way of protecting you and it most likely means you are injuring yourself," she said.

If the pain is localized to one body part, and you're able to finish a workout, Marcus said, you can continue working out as long as you're sure to seek medical treatment for whatever it is that is bothering you.

"For example, if your shoulder is bothering you, you should avoid irritating it further with shoulder presses, but there's no reason you can't keep working out your lower body," she added. "Just make sure to eventually seek out treatment for your shoulder."

Always listen to your body because toughing it out through an injury could end up sidelining you longer. If your pain is sharp, stabbing, or severe, or if you experience swelling, bruising, or any sort of open wound, you should seek medical assistance.

If you're experiencing dizziness or feeling weak long after your workout, that's not a good sign.

Mitchell Starkman, a sports and orthopedic physical therapist based in Canada, told BI that some dizziness is normal, but it shouldn't persist.

"If you're consistently getting dizzy while working out, it's always a good idea to follow up with your doctor first," he said, "That being said, many people become temporarily dizzy while training during position changes."

Starkman added that, similar to feeling light-headed when you stand up too fast, this dizziness comes from your body readjusting to the pressure change caused by sudden movements (like squats or deadlifts), which can lead to a "momentary lapse of blood flow to the brain."

Another reason for dizziness could be your eating habits. Every person's dietary needs vary, but if you're frequently working out on an empty stomach, it might make you feel woozy during a workout.

Consistent exercise can boost your immune system, however, overtraining can backfire and cause you to get sick.

"Exercise is an amazing thing, and it, when done consistently, actually boosts our immune system over time," Starkman told BI. "That being said, when it's too intense, after our workouts, the body's immunity actually slightly drops for a few hours, making us more susceptible to sickness."

If you're constantly getting sick, you might want to reassess your fitness regime and make sure you're planning enough rest days and properly fueling your body before and after your workouts.  

Exercise is thought to benefit the quality of your sleep, but if you're lying awake at night tossing and turning, it means you might be overtraining.

"Insomnia is a sign that your sympathetic nervous system is not functioning healthily and is directly linked to exercising too much," Chelsea Axe, a board-certified chiropractic physician and certified strength and conditioning specialist at DrAxe.com, told BI.

She continued, "An overactive sympathetic nervous system and trouble sleeping are more closely linked to anaerobic activities, like sprinting, and especially heavy resistance training, like weightlifting."

Since the sympathetic nervous system is closely connected to the brain's fight-or-flight response, these kinds of exercises can easily cause insomnia or restlessness. Working out earlier in the day or scaling back on workout frequency and intensity can help alleviate sleep issues tied to your workout.

"Exercisers with signs of an overactive sympathetic nervous system could benefit from regular meditation, gentle yoga, and massage," Axe said. 

If you find yourself feeling tired all the time or leaving the gym feeling exhausted instead of energized, you might need to scale it back.

"Sore muscles are common with a new routine, but excessive fatigue is not. If you are getting adequate sleep and are still super tired, there [might be] a couple of reasons," Megan Ostler, a registered dietitian and the director of nutrition at iFit, told BI.

One common reason for it, especially in women, is iron deficiency anemia.

"When we are deficient, we can't transport as much oxygen, and without enough oxygen, our muscles and organs can't perform the way they should, including converting nutrients to energy," she said. "Low energy production means low energy for us."

Another common reason for fatigue is not consuming enough calories pre- and post-workout.

"Our bodies work hard to make sure we don't die from starvation, so when our food intake decreases or exercise increases, our bodies must adapt," Ostler told BI. 

Although it's true that you might find yourself hungrier than usual as your body adapts to a new fitness routine, suddenly finding that you're never hungry should set off some alarm bells.

"Many athletes assume that they can just follow their hunger cues to know how much to eat. However, that isn't always the case," Ostler told BI. "If you are working out at a high level your appetite might actually be suppressed."

When we sweat, our body releases endorphins, the feel-good hormones that make us feel relaxed and alleviate stress. However, Axe said, exercise can actually also lead to spiked levels of anxiety or depression.

"Too much aerobic activity can lead to parasympathetic overtraining," she said. "Symptoms of this include fatigue, depression, and impaired sports performance."

She continued, "Overtrained athletes can also suffer from adrenal dysfunction, in addition to mood disorders exacerbated by excessive cortisol levels in the body."

A telltale sign that you're overdoing your workout routine is if your heart rate is fluctuating at rest.

"If you're new to exercise, variation in resting heart rate is expected as your body gets into better shape," Axe said. "But for seasoned exercisers, heart rate variability may be an easy way to pick up on early signs of overtraining."

Muscle soreness is common in the days after a particularly strenuous workout, but it shouldn't completely sideline you — and it should go away relatively quickly.

If your muscles are constantly sore and achy, you might be overtraining.

"When you work out, you cause small micro-tears to your muscles," Emily Paskins, a personal trainer at iFit, told BI. "This breakdown is then built over, which causes muscle growth. However, if you are constantly 'tearing' the muscles down without allowing adequate time for them to rebuild, you will begin to cause a state of constant wear and soreness."

This story was originally published in May 2018 and most recently updated on January 8, 2025.

Read More:

• 17 exercise habits that are actually hurting you
• 21 sneaky signs you're stressed — even if you think you aren't
• 9 warning signs you're running too much