Anyone who suffers from migraines knows how horrific they can be - blinding, painful and debilitating.
So pregnant women who are prone to them might need to take more care than others.
A Danish study has revealed that rates of miscarriage, premature birth and pre-eclampsia are higher in mums-to-be who also get those pesky migraines.
Researchers looked at 250,000 mothers-to-be and found that women who had severe headaches are 50 percent more likely to be affected by high blood pressure during pregnancy.
As well as that, they're more likely to get pre-eclampsia, which is a deadly condition that threatens the life of mum and baby.
Researchers from Aarhus University Hospital in Denmark compared the pregnancies of 22,841 women who get migraines with 228,324 women who don't during a period of seven years.
Migraine-sufferers were 21 percent more likely to give birth prematurely and had a ten percent higher chance of having a miscarriage.
The study also said that treating migraines does not reduce the risk of complications, which suggests that there are underlying problems - like high blood pressure - at play here.
So, pregnancy problems relating to migraines are more likely to be a biological problem, and not caused by any drugs like paracetamol which are used to treat migraines.
It all comes down to genetic factors and all you can do is take the best care possible of your body while expecting.