Whether cerebral thrombosis is a major disease or not depends on the extent of the attack. If the cerebral thrombosis is mild, the patient will only show mild hemiparesis and mild numbness, which can be mostly recovered after active treatment. In the case of severe cerebral thrombosis, coma and unstable vital signs will occur, and even after resuscitation, sequelae will occur, which is a major disease. As for whether the insurance company considers it a major disease, it depends on whether the insurance policy contains this article and whether it includes cerebral thrombosis, not on the severity of the disease. Generally, mild cerebral thrombosis is not covered by major diseases. Severe cerebral thrombosis with sequelae is covered by major diseases. What is considered severe? For example, permanent neurological disorders are covered under Major Illness. Permanent neurological dysfunction means that 180 days after the diagnosis of the disease, there are still serious sequelae, such as complete loss of limb skills on more than one side, complete loss of speech and chewing and swallowing ability, complete loss of ability to live independently, and inability to perform basic daily living independently, and the above can be covered under major diseases.