Patients often have the symptoms of dizziness for a while, mainly consider the following causes: 1. To consider is caused by postural hypotension, this condition is mainly seen in patients in the process of getting up violently will appear a transient dizziness, may be accompanied by symptoms such as blackness in front of the eyes, blackness of vision. This condition is mainly seen in patients with hard cerebral arteries or usual low blood pressure or anemia, and the blood pressure is not adjusted in time during the process of getting up, which can easily cause a transient lack of blood supply to the brain, and the patient will have sudden dizziness; 2. Patients with regular dizziness for a while should also be considered to be caused by otoliths, but the attack is mainly characterized by transient dizziness in the process of specific head position changes, and in severe cases, it may be accompanied by nausea, blackness, and blackness of vision. However, the episodes are mainly characterized by transient dizziness during specific head position changes, and may be accompanied by nausea, vomiting, and visual rotation, which can be clarified by doing positional tests.