Bladder cancer is a type of cancer that begins in the bladder, the organ that is responsible for storing and expelling urine. While bladder cancer may not always show warning signs and symptoms in its early stages, there are crucial signs that, if recognized early, can lead to timely diagnosis and increased chances of an effective treatment. Hence, individuals must be aware of certain warning signs that may indicate bladder cancer, such as the following. Blood in urine Blood in urine, clinically known as hematuria, can occur in visible or microscopic forms. In cases of visible blood (also called gross hematuria), one might notice an unusual pink, red, or brownish discoloration in their urine, which may indicate the presence of blood. Microscopic hematuria (also called microhematuria) indicates that blood in the urine is not visible to the naked eye. It can only be detected through laboratory tests, which emphasizes the need for regular checkups. It is also important to note that the presence of blood in urine does not definitively point to bladder cancer. It may also be due to bladder or kidney stones, intense exercises, kidney injury, or urinary tract infections. Regardless, it is still a matter of serious concern and requires immediate medical attention.