Pregnancy headaches most commonly feel like a dull, squeezing pressure on both sides of the head. About 18% of pregnant women experience headaches during pregnancy, and the sensation varies depending on whether you’re dealing with a tension headache, a migraine, or something that needs medical attention. Understanding what’s typical can help you tell the difference.
How Tension Headaches Feel
Tension headaches are the most common type during pregnancy. They produce a steady, squeezing pain on both sides of the head, often described as a band tightening around the forehead or the base of the skull. The pain is dull rather than sharp, and it tends to build gradually over hours rather than hitting all at once. You can usually still function, even though the discomfort is persistent and draining.
These headaches often settle in the forehead, temples, or the back of the head and neck. They don’t typically come with nausea or sensitivity to light, which is one way to distinguish them from migraines. They can last anywhere from 30 minutes to several hours, and some women notice them becoming a near-daily occurrence during the first trimester before tapering off.
How Pregnancy Migraines Feel
Migraines are a different experience entirely. The pain is usually throbbing or pulsing, concentrated on one side of the head rather than both. It’s often intense enough to make normal activities impossible. Migraines during pregnancy frequently come with nausea, vomiting, and a strong sensitivity to light, sound, or certain smells.
Some women also experience aura before the pain starts. Aura can look like flashing lights, zigzag lines, blind spots, or a shimmering effect at the edges of your vision. It typically lasts 20 to 60 minutes and then gives way to the headache itself. If you’ve never had migraines before and suddenly develop them with aura during pregnancy, that warrants a call to your provider, since new visual symptoms can sometimes signal other conditions.
Women who had migraines before pregnancy often find they actually improve during the second and third trimesters, as hormone levels stabilize. But for some, pregnancy migraines are a new or worsening problem, particularly in the first 12 weeks.
Why Pregnancy Triggers Headaches
Hormone shifts are the primary driver, especially in the first trimester. Rising estrogen and progesterone levels affect blood vessels and pain signaling in ways that make headaches more likely. Blood volume also increases significantly in early pregnancy, which changes circulation patterns and can contribute to head pain.
Beyond hormones, several everyday triggers become more common during pregnancy. Caffeine withdrawal is a big one: many women cut back on coffee after a positive test, and even modest reductions can cause headaches for a week or two. Dehydration is another frequent culprit, since pregnancy increases your fluid needs. Low blood sugar from nausea or inconsistent eating, poor sleep, and the physical tension of adapting to a changing body all play a role too.
Relief Options During Pregnancy
Acetaminophen remains the safest over-the-counter pain reliever during pregnancy. Both aspirin and ibuprofen carry documented risks to the fetus. The FDA specifically warns against using NSAIDs like ibuprofen at 20 weeks or later, because they can impair the baby’s kidney function and reduce amniotic fluid levels. After 30 weeks, NSAIDs also carry a risk of prematurely closing a critical blood vessel in the baby’s heart.
That said, the FDA has also encouraged clinicians to use acetaminophen judiciously rather than reflexively, noting that most short-term discomfort doesn’t necessarily require medication. For mild to moderate headaches, non-drug approaches are worth trying first: a cold compress on the forehead or back of the neck, resting in a dark quiet room, staying hydrated, and eating regular small meals to keep blood sugar steady.
For women who get frequent migraines, magnesium oxide supplements at up to 400 mg daily are considered safe during pregnancy (pregnancy category A) and have evidence behind them for migraine prevention. The American Migraine Foundation notes magnesium is a reasonable preventive option for people who are pregnant or may become pregnant. It’s inexpensive, available without a prescription, and well tolerated, though it can cause loose stools at higher doses.
Headaches That Signal Something Serious
Most pregnancy headaches are uncomfortable but harmless. A small number, however, point to preeclampsia or other dangerous conditions. Preeclampsia headaches are described as a dull, throbbing, migraine-like pain that won’t go away, often accompanied by sensitivity to light. The key difference is that this headache doesn’t respond to rest or acetaminophen, and it tends to appear after the midpoint of pregnancy alongside other symptoms: vision changes like blurred or double vision, flashing lights or spots, sudden nausea or vomiting, and significant swelling in the hands or face.
The CDC lists several headache-related warning signs that require immediate medical care during pregnancy:
- A headache that won’t go away or gets worse over time, especially if it feels like the worst headache of your life
- Sudden “thunderclap” onset, where severe pain hits instantly rather than building gradually
- Visual disturbances like flashing lights, bright spots, blind spots, or blurry and double vision
- Headache with fever of 100.4°F or higher
- Headache with extreme swelling in the hands or face, to the point where you can’t bend your fingers or wear rings
- Headache with dizziness or fainting
A standard tension headache or mild migraine that responds to rest, hydration, and acetaminophen is almost always benign. A headache that breaks through those measures, especially after 20 weeks, deserves prompt attention. The distinction matters most in the second half of pregnancy, when preeclampsia becomes a real possibility and early detection makes a significant difference in outcomes for both mother and baby.