Priority 5 from the Blood Pressure in Pregnancy PSP

UNCERTAINTY: What is the cause of pregnancy hypertension (including pre-eclampsia)? (JLA PSP Priority 5)
Overall ranking 5
JLA question ID 0099/5
Explanatory note Not available for this PSP
Evidence

None identified 
Health Research Classification System category  Reproductive health and childbirth
Extra information provided by this PSP
Original uncertainty examples What are the causes of high blood pressure in pregnancy ~ Why does it happen? ~ What are the causes ~ What causes high blood pressure in pregnancy when I have never had blood pressure problems in the past? ~ Why does it happen Why did I suffer with hypertension in my pregnancy? ~  When I do not smoke, drink, not overweight I am not over 35 and do not fit any of the 'types' that I was told would 'be likely' to have hypertension? 
Submitted by 27 women, 1 who knew a person/relative/friend with pregnancy hypertension, 6 healthcare, 2 researchers, 1 other
PSP information
PSP unique ID 0099
PSP name Blood Pressure in Pregnancy
Total number of uncertainties identified by this PSP.

50 (To see a full list of all uncertainties identified, please see the detailed spreadsheet held on the JLA website)
Date of priority setting workshop 20 June 2019