The precursors of cerebral thrombosis mainly include: 1. Sudden onset of vertigo. Dizziness is an extremely common symptom among the precursors of cerebral thrombosis and 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 at night in pain. If you have one of the above precursors of cerebral thrombosis, you should go to hospital for examination and treatment as early 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. 80% of people suffering from ischemic cerebral thrombosis will have yawning 5-10 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 develop cerebral thrombosis within six months. 6.Abnormal blood pressure. A sudden and sustained increase in blood pressure above 200/120mmHg is a precursor to cerebral thrombosis; a sudden drop in blood pressure below 80/50mmHg is a precursor to the formation of cerebral thrombosis. 7. Other precursor 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.