What Can Cause Concentrated Urine?

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Concentrated urine has a dark brownish appearance, whereas normal urine has a yellowish appearance. The brown discoloration of urine is as a result of health conditions, such as jaundice, gallstones, liver cancer, porphyrias, sickle cell anemia, heart disease, renal arterial stenosis, alcohol liver disease, pancreatic cancer, yellow fever and renal cell cancer.