Preeclampsia is more prevalent in populations where malnutrition, especially less than 50 gm complete protein per day after 12 weeks of pregnancy, is common.

Exact cause still unknown, there are some theories that causes preeclampsia, one of them is placental hormones that causes vasoconstriction but even in postpartum period preeclampsia may appear so the exact cause still unknown.

Proteinuria is not a mandatory for diagnosis of PE.

The causes are unknow

Yes I agree with Prof Vito,the ethiologiological factors of the PE are numerous,but unknown.