As if moms with diabetes or kidney disease didn't have enough to deal with, numerous chronic diseases in the mother can also act as risk factors for miscarriage. Most of the time, moms will know that they have the disease already before pursuing pregnancy, but in some cases, recurrent miscarriages may be the first hint of a problem with the mother's health.
A good example of this is celiac disease, or intolerance of wheat proteins. Although the link is not yet fully understood, research increasingly points to celiac disease as a risk factor for recurrent miscarriages. Some people with celiac disease will have noticeable bowel symptoms but others may have no idea that they have the condition.
If you've had a miscarriage and have any suspicions that anything is amiss with your health, have a look at this list of maternal health conditions associated with miscarriage and be sure to speak with a physician about your concerns.