1. Preclinical symptoms

Headache, mostly in the back of the head, accompanied by symptoms such as nausea and vomiting. If you often feel headache, and it is very intense, and nausea and vomiting at the same time, it may be a signal to turn into malignant hypertension; Dizziness, female patients appear more, and they may feel when they suddenly squat or stand up; Tinnitus, tinnitus in both ears, lasting for a long time; Palpitation, shortness of breath, hypertension ...