DeepDoc is an AI-based decision support system for the early etiology diagnosis of neurological diseases using clinical data points from patients admitted to hospital within 24 hours.This study aims to evaluate whether the diagnosis of the DeepDoc AI-based decision support system is better than the doctor's initial diagnosis by a multi-center, superiority diagnostic study.

The doctor completes the admission note within 24 hours after the patient is admitted to the hospital. After informed consent is given to the patient who meet the inclusion criteria, open the DeepDoc to fill in the patient identification information. Then take the picture of the initial diagnosis of the admission note page and upload it to DeepDoc, fill the doctor's initial diagnosis into the DeppDoc. And put the patient's clinical data points into the DeepDoc to get a DeepdDoc diagnosis.

Inclusion Criteria:

1. Patients with clinical symptoms or signs suspected of stroke，meningitis/encephalitis, vertigo and headache.
2. Neurological examination results and imaging changes within 24 hours of admission.

Exclusion Criteria:

Patients discharged, transferred to the hospital, or died within 24 hours after admission.

4000 consecutive patients suspected of stroke，meningitis/encephalitis, vertigo and headache（1000 cases of each disease) are admitted to the department of neurology that consented to involvement in the study.