The precursors of cerebral thrombosis mainly include: 1. Sudden onset of vertigo. Vertigo is an extremely common symptom among the precursors of cerebral thrombosis, which can occur at any time before cerebrovascular disease, especially in the early morning when waking up. In addition, it also occurs easily after fatigue and bathing. Especially in hypertensive patients, if vertigo occurs repeatedly more than 5 times in 1 to 2 days, the risk of cerebral hemorrhage or cerebral infarction increases. 2. Sudden onset of severe headache. Any sudden onset of severe headache; accompanied by convulsive seizures; recent history of head trauma; accompanied by coma and drowsiness; sudden changes in the nature, location and distribution of headache; headache aggravated by coughing and exertion; severe pain, which can wake up in the night in pain. If you have one of the above precursors of cerebral thrombosis, you should go to hospital for examination and treatment as soon as possible. 3. Abnormal gait. Stumbling gait and walking leg weakness is one of the precursor symptoms of hemiplegia. If the gait of the elderly suddenly changes and is accompanied by numbness and weakness of the limbs, it is a precursor sign of cerebral thrombosis. 4. Yawning constantly. In 80% of people suffering from ischemic cerebral thrombosis, yawning will occur 5 to 10 days before the onset of the disease. 5.Nose bleeding in hypertensive patients. This is a danger signal that deserves attention. Several large nosebleeds, together with bleeding from the fundus and hematuria, such people may have cerebral thrombosis within six months. 6. Abnormal blood pressure. When blood pressure suddenly and continuously rises above 200/120mmHg, it is a precursor of cerebral thrombosis; when blood pressure suddenly drops below 80/50mmHg, it is a precursor of cerebral thrombosis formation. 7.Other aura symptoms. In addition to the above precursor symptoms of cerebral thrombosis, choking and coughing, difficulty in swallowing, sudden appearance of hemianesthesia, fatigue, drowsiness, tinnitus, etc. are also precursors of cerebral thrombosis.