In the first trimester, many women complain of sudden headaches. For women who had headaches before, these become worse during pregnancy. It is not known exactly how pregnancy triggers it, but some experts say it is due to sudden imbalance of hormones in the body of a pregnant woman; some say it could be due to erratic blood circulation during the early trimester, while still others blame it on the sudden cut-off of caffeine and alcohol by the would-be-mothers. There are other factors for the headache, like blood pressure, sinus, congestion, fatigue and even hunger. Whatever the reasons for the headache pregnancy can be made very insufferable by this symptom.

Experts estimate that about 15 percent of migraine sufferers get migraines for the first time when they're pregnant, most often in the first trimester. For women who previously experienced migraine headache pregnancy sometimes lessens it considerably, while for others it gets aggravated. Fortunately, for about 60 to 80% of women who are prone to migraines headache pregnancy brings about vast improvement. This is true mostly for women who experience onslaught of the migraine around their period's time.

For most women, the headaches diminish or even disappear in the second trimester, when the hormones stabilize and the body gets adapted to its new chemistry. For some it remains a pestilent pregnancy sign till the term end.

A headache in the second or third trimester could be serious. It could be a sign of severe preeclampsia, which is a serious pregnancy-induced syndrome consisting of high blood pressure, protein in the urine, and other changes.  Another danger pregnancy sign is when the headache is accompanied by a fever and a stiff neck or is accompanied with blurry vision, slurred speech, drowsiness, numbness, or a change in alertness.

Pregnant women should be encouraged to use non-pharmacological measures as a first-line treatment for migraine/headaches; measures such as trigger identification, lifestyle change, ice, rest, biofeedback and relaxation. However, if an expectant mother needs medication for headache pregnancy should be kept in mind, so medications with the highest degree of safety be used.
 
One of the safest alternative treatments for headache pregnancy tolerates well, is the herbal remedy. Herbs like hops, skullcap and catnip are effective in alleviating tension headaches. The recipe is, one tsp of each herb be boiled for 20 minutes in two cups of water. It can be reheated but should not be brought to boil a second time.] Peppermint oil also has remarkable easing powers. A few drops rubbed on the temples can feel like a miracle cure.

It is common knowledge how pregnancy affects bones. It may not be so well known that Calcium can be used for pain relief. When taken alone, it tends to quiet your nerves and ease pain. For a more stimulating effect, it should be taken in combination with 100mg of vitamin C. A dose per day could be anything between 450mg to 1800mg, depending on how serious the pain is.

It is important to mention here, that no medication should be taken without the doctor's advice and monitoring during pregnancy.