Xu points out that preeclampsia happens when the cells of the placenta begin to emit a substance about which the medical community still knows very little. It makes their blood vessels contract and continually raises their blood pressure. Clinically, it often results in protein in the urine and unusual swelling throughout the body.
徐振傑指出，妊娠毒血症是指部分孕婦的胎盤細胞，會分泌出一種目前醫界還不清楚的物質，致使她們的血管不斷收縮、血壓持續飆高；臨床上則常合併尿蛋白、全身性水腫等症狀。