Miscarriages are always devastating for any woman, who is expecting. As difficult as it is to deal with, miscarriages are fairly common and about 20 to 30% of pregnancies end in miscarriages. Most miscarriages take place in the early stages of a pregnancy and even before the woman knows she is expecting. No matter when it happens, it is still heartbreaking. But what are some of the common causes for miscarriages? Can a miscarriage be prevented?