For symptomatic haemorrhagic transformation, there is usually an exacerbation of the original cerebral infarction symptoms or the appearance of new symptoms, which is determined by the location and amount of intracranial bleeding, etc. Doctors can mostly detect the disease through regular physical examination, routine head CT or MRI review, but asymptomatic haemorrhagic transformation usually does not show a change in clinical symptoms, so it can only be detected through routine head imaging.