What causes blood clots?
![What causes blood clots?](https://cdn.mos.cms.futurecdn.net/hXfv8UCCFuvEU4VkZcvkpZ.jpg)
Blood clots can be dangerous, especially if all or part of them break off and then travel through the bloodstream.
Blood clots can be dangerous, especially if all or part of them break off and then travel through the bloodstream.