Brain tumor is also called intracranial tumor. It is important to grasp the early symptoms of brain tumor for early treatment. Early symptoms mainly include: 1. morning headache, which often occurs at 4 or 5 o’clock in the morning and often wakes up in the middle of sleep, so it is called “morning headache”. 2. Compared with vomiting in gastrointestinal diseases, vomiting in brain tumor patients is not accompanied by gastric distension, nausea, abdominal pain and diarrhea. The vomiting is not related to eating, but occurs suddenly after a headache. 3.Visual impairment. After brain tumor causes brain pressure increase, poor blood flow in eye veins leads to stagnation and edema, which can damage the visual cells on retina in the fundus of the eye and cause vision loss. Some patients show an incomplete range of visual field defects. 4. Monocular protrusion, where one side of the eye protrudes forward, leading to incomplete eyelid closure in severe cases. 5.Phantom sniffing, which occurs because the temporal lobe in the lower part of the brain is stimulated by the tumor, patients often smell odors that do not exist, such as the smell of burning rubber, burnt rice or incense. Transient loss of recognition. People with temporal lobe brain tumor may also have a sense of strangeness and déjà vu, which may occur for several minutes. 7. Hyperalgesia. A tumor in the parietal lobe, located in the middle of the cerebral hemisphere, can cause a variety of sensations in the contralateral hemisphere – pain, hot and cold, touch, vibration and shape discrimination. 8. Unilateral deafness, if there is no history of otitis media and only one ear is hypoacusis, it is likely to be caused by the intracranial tumor compressing the auditory nerve. 9. Late onset epilepsy, if epilepsy starts to occur in adulthood, if there is no other cause, brain tumor should be considered first.