Treatment should be continued from the time of diagnosis to several weeks postpartum given the increased risk of medical complications immediately following delivery of the fetus. Prognosis
The effects of high blood pressure during pregnancy vary depending on the disorder and other factors. Preeclampsia does not in general increase a womans risk for developing chronic hypertension or other heart-related problems. Women with normal blood pressure who develop preeclampsia after the 20th week of their first pregnancy, short-term complications, including increased blood pressure, usually go away within about six weeks after delivery.Some women, however, may be more likely to develop high blood pressure or other heart disease later in life. More research is needed to determine the long-term health effects of hypertensive disorders in pregnancy and to develop better methods for identifying, diagnosing, and treating women at risk for these conditions.Even though high blood pressure and related disorders during pregnancy can be serious, most women with high blood pressure and those who develop preeclampsia have successful pregnancies. Obtaining early and regular prenatal care for pregnant women is important to identify and treat blood pressure disorders. Epidemiology
High blood pressure problems occur in six percent to eight percent of all pregnancies in the U.S., about 70 percent of which are first-time pregnancies. In 1998, more than 146,320 cases of preeclampsia alone were diagnosed.Although the proportion of pregnancies with gestational hypertension and eclampsia has remained about the same in the U.S. over the past decade, the rate of preeclampsia has increased by nearly one-third.
ICHD criteria
The ICHD diagnostic criteria are:
Headache that, within 3 days of onset, fulfils criteria 2-4
Headache is present daily, and is unremitting, for > 3 months
At least two of the following pain characteristics:
bilateral location
pressing/tightening (non-pulsating) quality
mild or moderate intensity
not aggravated by routine physical activity such as walking or climbing
Both of the following:
no more than one of photophobia, phonophobia or mild nausea
neither moderate or severe nausea nor vomiting
Not attributed to another disorderNotes:

Headache may be unremitting from the moment of onset or very rapidly build up to continuous and unremitting pain. Such onset or rapid development must be clearly recalled and unambiguously described by the patient. Otherwise it is coded as 2.3 chronic tension-type headache. History and physical and neurological examinations do not suggest any of the disorders listed in groups 5-12 (including 8.2 medication overuse headaches and its subforms), or history and/or physical and/or neurological examinations do suggest such disorder but it is ruled out by appropriate investigations, or such disorder is present but headache does not occur for the first time in close temporal relation to the disorder. Criteria revision
Although the original Silberstein–Lipton criteria and the original description by Vanast make no suggestion for the exclusion of migrainous features in NDPH, the current ICHD criteria exclude patients with migrainous features. When migraine features are present, classification thus becomes problematic. It has been reported that migraine symptoms may be present in over 50% of NDPH patients. The current criteria definition thus excludes more than half of patients with new onset of daily headache.