Can you tell me, are multiple ct scans dangerous?

CT: Radiation risk is cumulative over a lifetime, so multiple scans increase cancer risk. You can calculate the theoretical increased risk of multiple scans at xrayrisk.com. The important consideration is that the benefit of the CT scan should outweigh the minimal increased risk.

Depends: The cancer risk from each CT is very minor (a fraction of one percent), especially when compared to the lifetime risk of developing a cancer from any cause (approximately 40 percent). As for getting multiple CTs, it's really a risk benefit analysis, and it really depends on what you are getting the CT for. I think it's appropriate to speak with your doctor about this issue.