Understanding Rhabdomyolysis: Causes, Symptoms, Prevention, and Treatment 

Rhabdomyolysis is a severe and potentially life-threatening medical condition characterized by the breakdown of skeletal muscle tissue, releasing muscle contents into the bloodstream. This can lead to: 

• Renal failure 

• Electrolyte disorders 

• Cardiac arrhythmias 

• Respiratory failure 

• Sepsis 

• Death

 Common Causes of Rhabdomyolysis

1. Prolonged muscle exercise or heavy weight training 
2. Inadequate nutrition or dehydration 
3. Exercising while sick or with elevated body temperatures 
4. Consuming certain medications or drugs (e.g., statins, corticosteroids) 
5. Engaging in arduous repetitive exercise (e.g., spin cycling, CrossFit) 
6. Trauma or crush injuries 
7. Extreme temperatures or environmental conditions 

Signs and Symptoms of Rhabdomyolysis

1. Muscle ache or pain (often severe) 
2. Swelling of involved muscles 
3. Dark or tea-colored urine due to myoglobinuria 
4. Fatigue, weakness, or loss of muscle function 
5. Nausea, vomiting, or confusion 
6. Decreased urine output 

How does rhabdomyolysis cause urine to be brown?

• Muscle damage

Rhabdomyolysis leads to muscle breakdown, releasing myoglobin and other muscle contents into the bloodstream.

• Myoglobin release

Myoglobin, a protein in muscle cells, is released into the bloodstream.

• Kidney filtration

The kidneys filter the bloodstream, attempting to remove waste products, including myoglobin.

• Myoglobinuria

Excess myoglobin in the bloodstream overwhelms the kidneys, causing it to spill into the urine.

• Urine discoloration

Myoglobin in the urine gives it a characteristic brown or tea-colored appearance due to its pigmented nature.

Brown urine may also have other characteristics:

• Dark or amber-coloured
• Cloudy or turbid
• Strong or pungent odour

Other signs of rhabdomyolysis-induced myoglobinuria:

• Decreased urine output
• Increased serum creatinine kinase (CK) levels
• Electrolyte imbalances (e.g., potassium, sodium)

Prevention Strategies 

• Proper hydration before, during, and after workouts 

• Avoid exercising while sick or with fever 

• Gradually progress exercise intensity and duration 

• Take regular rest with stretching 

• Attend beginner exercise classes and progress slowly 

• Listen to your body: stop exercising if experiencing muscle weakness, pain, or fatigue 

• Balance electrolytes through diet and supplements 

• Consult a doctor before starting new exercise programs

Additional Tips

1. Warm up and cool down properly 
2. Monitor urination frequency and color 
3. Avoid excessive exercise intensity or duration 
4. Stay hydrated during and after exercise 
5. Seek medical attention if symptoms persist or worsen 

 Treatment and Management

1. Immediate medical attention if symptoms occur 
2. Intravenous hydration and electrolyte replacement 
3. Monitoring of kidney function and urine output 
4. Pain management with medication 
5. Rest and avoidance of strenuous activity 
6. Hospitalization may be necessary in severe cases 

References: 

• The Straits Times. (2022, May 3). Start slow when exercising, medical experts say as rhabdomyolysis cases increase. Retrieved October 4, 2024, from (link unavailable) 
• National Institute of Arthritis and Musculoskeletal and Skin Diseases. (2022). Rhabdomyolysis. Retrieved from (link unavailable) 
• American College of Sports Medicine. (2018). ACSM’s Sports Medicine: A Comprehensive Review. Philadelphia, PA: Wolters Kluwer. 
• National Institute of Diabetes and Digestive and Kidney Diseases. (2022). Rhabdomyolysis. 
• American Journal of Kidney Diseases. (2019). Myoglobinuria and Rhabdomyolysis. 
• European Journal of Emergency Medicine. (2018). Rhabdomyolysis-induced acute kidney injury.