Understanding Rhabdomyolysis after Workout: When Exercise Turns Dangerous

I love seeing people push toward their goals—training harder, getting stronger, and feeling more confident in their bodies. But every now and then, a story comes along that reminds me how quickly things can shift when intensity outweighs awareness.

Recently, a 41-year-old woman from Scotland found herself in a hospital bed after an intense karate class. Her symptoms? Muscle soreness that quickly escalated, and a disturbing sign—her urine had turned a dark, cola-like colour. Turns out she was dealing with a condition called rhabdomyolysis after workout (exercise-induced rhabdomyolysis). This story was published on the Scottish Sun website recently.

And here’s the thing: She is not the only one! That’s why I wanted to highlight this case—it speaks to the importance of knowing the early signs of something that could potentially be life-threatening.

What is Rhabdomyolysis?

Rhabdomyolysis after workout happens when muscle tissue breaks down rapidly and releases proteins like creatine kinase or myoglobin into the bloodstream. When this builds up too much, the kidneys can’t filter it out effectively, and serious complications can set in, like kidney damage or even heart issues. Interestingly, this condition can be asymptomatic to life-threatening with acute kidney failure to Multiple Organ Dysfunction Syndrome (MODS), also known as multiple organ failure.

It’s rare, yes—but not unheard of. Especially in our world where people love pushing themselves, jumping into new fitness challenges, or doubling down on intensity without giving the body time to adapt. The main symptoms of rhabdomyolysis are severe muscle pain and weakness with characteristic dark urine. Creatine kinase (CK) levels will be raised, and there will be signs of blood in the urine test.

What are the Causes of Rhabdomyolysis After Workout

Rhabdomyolysis after workout is a serious condition that can be life-threatening. Severe muscle damage can lead to kidney failure if not treated quickly. The main factors that cause this condition include new or intense exercise, environmental conditions, certain medical issues, and pushing the body too hard. Understanding these causes is important to help prevent rhabdomyolysis after a workout in sports and training settings. Some of the risk factors are:

Unaccustomed Exercise

• Intensity and Duration: Doing high-intensity exercise that you’re not used to can be risky. This is especially true if you suddenly increase the intensity or duration of your workouts. This risk is higher for people who have been inactive or those who are returning to exercise after a break.
• Muscle Contraction Types: Eccentric muscle contractions happen when a muscle lengthens under tension, like when you lower a weight during a bicep curl.

Environmental Factors

Heat and Dehydration: Exercising in hot weather, especially when you are dehydrated, greatly increases your risks. Dehydration can harm your kidney function, making it harder for your body to remove myoglobin and other harmful substances from damaged muscles, which can make the situation worse.

Medical and Genetic Factors

• Pre-existing Conditions: Some viral or bacterial infections can increase the risk of rhabdomyolysis after workout. Certain medications, including pain relievers and anti-inflammatory drugs, can also raise this risk. Additionally, some people may be more susceptible due to genetic factors like certain muscle disorders.
• Electrolyte Imbalances: Low potassium and low sodium levels can lead to muscle damage, increasing the risk of rhabdomyolysis after workout

Overexertion and Punitive Exercise

Exercise as Punishment: Some people have developed rhabdomyolysis after workout and intense exercise, often because they were punished with excessive workouts or did not have proper training. This has been seen in sports teams where players went through intense workouts without enough preparation or guidance.

Other Contributing Factors

• Type of Activity: Certain activities, like military training, mountain climbing, and intense sports, can cause rhabdomyolysis after workout. These activities often require more effort than the body is ready to handle.
• Fatigue and Incomplete Medical History: Factors like being very tired before exercising can cause episodes of rhabdomyolysis after a workout

Who’s at Risk?

This isn’t just a condition for elite athletes or ultra-endurance competitors. It can happen to anyone who is training in extreme conditions and individuals with certain health problems such as chronic kidney disease. You might be at risk if:

• When you start an intense exercise program without training, guidance and a plan.
• Not drinking enough water while working out hard.
• Football players often train in very challenging conditions, and exercising in hot weather can cause muscle damage. This might lead to rhabdomyolysis after workout.
• If you do exercises that strain your muscles without proper guidance from a specialist, you can increase your risk of injury.
• If you take specific medications like NSAIDs and engage in high-intensity workouts.

What to Watch For

Here are some signs I always ask clients to look out for after an intense session:

• Unusual muscle pain or swelling that doesn’t feel like normal soreness
• Muscle weakness or feeling “wobbly”
• Nausea or disorientation
• And the big one—dark, cola-coloured urine
• If these show up, it’s not something to push through. It’s something to get checked out—fast.

What We Can Do

Here’s the cool part. This is one of those situations where education and collaboration can make a big impact. Preventing rhabdomyolysis after workout it takes awareness, pacing, and smart support.
This is what I focus on with my clients:

• Building up intensity over time, not all at once
• Prioritising hydration, especially in warmer environments
• Programming recovery as seriously as we program lifts
• Teaching people to recognise what’s just muscle fatigue vs. a red flag
• And keeping open communication across teams—whether that’s a trainer, physio, or therapist

Final Thoughts

This story, published in the Scottish Sun, reminds us that even when everything seems “normal,” the body sometimes says otherwise. It also reminds us how powerful our role can be—educating people, guiding them with care, and creating plans that help them grow safely. Exertional rhabdomyolysis is usually underestimated, and it is essential to seek professional advice for persistent muscle soreness/cramps and shout for medical attention when dark urine appears after heavy endurance events.