It is terrifying to think about, but sometimes the tools used to diagnose illness can cause illness themselves. According to a recent Wall Street Journal article, CT scans, which use radiation to detect abnormalities, have been linked to a higher risk of cancer than previously thought. This is quite an alarming finding because, as reported in the article, the use of the computerized tomography scan has tripled in the US since the beginning of the 1990s. Over 70 million were performed in 2007 alone. With CT scans linked to cancer, there is even more reason to be aware of and involved in your own health and medical treatment.