Low blood pressure 90mmHg dizziness is caused by insufficient blood supply to the brain due to high blood pressure. Low blood pressure is also called diastolic blood pressure, normal people’s blood pressure range is relatively stable, systolic blood pressure in the 90 to 120mmHg around, diastolic blood pressure in the 60 to 80mmHg around. A low blood pressure of 90mmHg indicates high blood pressure, and the ability to feel dizzy is due to insufficient cerebral blood supply caused by hypertension resulting in hardening of the blood vessels in the brain and narrowing of the blood vessels. In addition to dizziness, some patients may experience panic, shortness of breath, fatigue, insomnia, excessive dreams, and cardiac arrhythmias. Elevated diastolic blood pressure may be related to physiological factors such as psychological tension, overweight, high salt diet, irregular life, and prolonged late night, while other factors are pathological factors such as cervical spondylosis and secondary hypertension. Prolonged dizziness needs to go to the regular hospital for further examination, and if there is any abnormality, it is necessary to follow the doctor’s instructions to receive the relevant treatment.