The site of deep headache is in the head, and the department to which it belongs is internal medicine, neurology, and the diseases associated with it are brain abscess, headache, meningitis, hydrocephalus, meningioma, cranial fossa meningioma, and intracerebroventricular meningioma. Deep headaches are most often seen in brain abscesses, encephalitis, and brain tumors with external radiation to the ipsilateral side. Possible associated symptoms are throbbing headache, convulsions, epileptic headache, dull pain, excessive dreaming, nausea, fatigue, and recurrent headache. What are the examination methods to check for deep headache? 1.Cranial MRI examination Cranial MRI examination is an MRI examination of the brain, which is used to observe whether there are lesions in the brain and can clarify whether the patient is caused by structural changes in the brain. Intracranial tumors often cause epilepsy, and MRI has an extremely high rate of diagnostic confirmation for low-grade astrocytomas, ganglia, gliomas, arteriovenous malformations and hematomas in the brain. 2.Cranial CT examination Cranial CT examination is a method of examining the cranial brain through CT. It can clearly show the anatomical relationship between different cross-sections of the skull and the specific brain tissue structure. Thus, it greatly improves the detection rate of lesions and the accuracy of diagnosis. In general, CT has better visualization of human hard tissues than soft tissues. Cranial CT examination is important for the diagnosis of most diseases in the skull, cranium and scalp (including trauma, tumor, inflammation, vascular lesions, poisoning, degenerative and metabolic diseases, etc.). 3.Cranial ultrasonography There are two kinds of cranial ultrasonography: B-type ultrasonography cranial examination method, mainly used for children within 2 years of age whose fontanelle is not closed, through the fontanelle as a “sound window” for scanning. Transcranial color Doppler imaging: through the temporal window, occipital window, orbital window to explore the cerebral arteries, according to the intracranial vascular flow velocity, frequency width, flow direction abnormalities or audio abnormalities and other determinations, applied to the diagnosis of cerebrovascular disease and etiological classification.