Gemma Underwood, 41, is an orange belt in karate, and said she felt sore after an “intense” session in March, according to ...

Her muscles were swelling and her urine was so dark she compared it to “Coca-Cola.” She rushed to the emergency room, where doctors diagnosed her with rhabdomyolysis. It’s “a rare muscle ...

Clear urine may mean they drink too much water, while dark brown urine can indicate liver disease. Urine color can be a useful indicator of how well-hydrated a person is. Certain foods and ...