There are several potential causes of headaches during pregnancy. Some are primary, and some are secondary. Primary headaches include any type of head pain that is simply due to the head pain itself. Primary headaches include migraines, tension headaches, and cluster headaches (often treated by triptan).
Secondary headaches are always due to other conditions (such as sinus congestion, high blood pressure, etc.) During early pregnancy, changes in blood volume and hormone levels can lead to sinus headaches or full-blown thunderclap headaches.
You may also experience caffeine withdrawal headaches during the first trimester as your body goes without caffeine (yes, this is a real thing!) If you want to avoid this particular migraine trigger, it’s a good idea to slowly wean yourself off caffeine if you plan on becoming pregnant. Of course, this step isn’t possible if your little bundle of joy ends up being an unplanned (but still amazing) surprise.
Other potential causes of migraine headaches while pregnant include:
- Lack of sleep
- Too much stress
- Poor nutrition
- Little to no physical activity
- Hormone-induced vision changes (including increased light sensitivity)
- Low blood sugar
- Dehydration
- High blood pressure
- Diabetes
- Preeclampsia
Some of the causes listed above are quite mild, while others are indicative of serious pregnancy complications. The good news is that the most serious causes of pregnancy headaches are generally rarer. Still, it’s important to pay close attention to any headache during pregnancy, so you know when it’s time to seek emergency medical treatment.