Eclampsia is a type of hypertensive disorder of pregnancy. Hypertensive disorders of pregnancy include gestational hypertension, preeclampsia, eclampsia, chronic hypertension complicated by preeclampsia, and chronic hypertension combined with pregnancy. The specific type of hypertensive disorders in pregnancy is determined by medical history, physical examination and relevant laboratory tests. However, eclampsia is a relatively severe form of hypertensive disorders of pregnancy, mostly with convulsions that cannot be explained by other causes on top of preeclampsia. Therefore, before understanding eclampsia, it is important to be familiar with preeclampsia. Pre-eclampsia is divided into mild and severe, with pregnant women presenting with systolic blood pressure ≥ 140 mmHg and/or diastolic blood pressure ≥ 90 mmHg after 20 weeks of gestation, with proteinuria ≥ 0.3 g/24h, or random urine protein (+). In contrast, patients with severe preeclampsia present with persistently elevated blood pressure and urinary protein, with maternal organ insufficiency or fetal complications. Eclampsia occurs when a pregnant woman has convulsions on top of preeclampsia that cannot be explained by other causes. The onset of eclampsia may be preceded by worsening severe preeclampsia, but it can also occur in cases with insignificantly elevated blood pressure and no proteinuria. The eclamptic convulsions progress rapidly, with the prodromal symptoms briefly manifesting as convulsions, facial congestion, foaming at the mouth, and deep coma; this is followed quickly by a typical generalized hypertonic clonic convulsion, rhythmic muscle contractions and tension lasting about 1-1.5 minutes, during which the patient has no respiratory movements; thereafter the convulsions stop and respiration resumes, but the patient remains comatose, and finally consciousness returns, but with confusion, irritability, irritability, and other mood changes. In general, eclampsia occurs mostly before delivery, but also in about 25% of patients 48 hours after delivery. Since eclampsia can be a serious threat to the life of the pregnant woman and her fetus, timely prevention is needed. When a pregnant woman finds that her blood pressure is elevated, she needs to seek medical attention.