Cerebral blood supply insufficiency can be diagnosed through general examination, laboratory test, imaging test, etc. Meanwhile, it needs to be diagnosed by the doctor after combining the relevant examination results and comprehensive assessment of the condition. 1. General examination: usually cerebral blood supply insufficiency will lead to cerebral ischemia, lack of oxygen, depression, anxiety, and headache, dizziness and other symptoms; secondly, cerebral blood supply insufficiency is commonly found in high blood pressure, atherosclerosis, heart failure and other diseases; therefore, asking patients about the history of their illnesses can lead to a preliminary diagnosis. 2. Laboratory tests: usually check the indicators of blood glucose, blood lipids, blood viscosity, etc. If it exceeds the normal range, it will lead to the blockage of blood vessels, or cause cerebral circulatory disorders, and cerebral blood supply insufficiency occurs; therefore, the results of the above tests can be used as the indicators of the confirmation of the diagnosis. 3. Imaging examination: common examinations include digital subtraction angiography, transcranial Doppler, cranial magnetic resonance imaging, cranial CT examination, etc., which can clearly identify whether there are lesions or occupations in the blood vessels of the brain, which may lead to blockage of blood vessels or cause insufficient cerebral blood supply due to compression. When the above symptoms occur, it is recommended to go to the hospital in time and choose the appropriate examination methods under the guidance of the doctor to confirm the diagnosis and carry out standardized treatment as soon as possible.