Aspirin may not be the simple cancer shield many hoped for. While possible benefits are uncertain and slow to emerge, the risk of serious bleeding starts immediately. Credit: Shutterstock Taking aspirin every day is not a fast or dependable way to prevent bowel cancer for most people, according to a new Cochrane review. The analysis also highlights a clear downside. Regular aspirin use increases the risk of serious bleeding right away. Bowel cancer, also called colorectal cancer, ranks among