In real life, most people lack of basic knowledge about brain tumor, and many patients do not get early diagnosis and treatment in time and their lives are cut short, so it should attract people’s attention. Now, several early warning signals of brain tumor are described as follows: 1. Headache: the nature of headache is more intense, often occurring in the early morning, sometimes waking up with pain in sleep, but the headache will be gradually relieved or disappeared after waking up and mild activities. Vomiting: due to the increase of intracranial pressure, the medullary respiratory center is stimulated, thus vomiting occurs, and vomiting mostly occurs after the headache, in the form of jet. 3, visual impairment: increased intracranial pressure will make the venous blood return to the eye is not good, resulting in bruising and edema, damage to the visual cells on the retina of the fundus of the eye, resulting in vision loss. 4, mental abnormality: brain tumor located in the frontal lobe of the anterior part of the brain can destroy the mental activity of the frontal lobe, causing excitement, agitation, melancholy, depression, forgetfulness, fiction and other mental abnormalities. Unilateral limb sensory abnormality: the parietal lobe located in the middle of cerebral hemisphere is specialized in sensory control, and the tumor in this part of the brain will often lead to unilateral loss or disappearance of limb pain, warmth, vibration, and shape discrimination. 6, phantom smell: temporal lobe tumor may appear phantom smell under its stimulation, that is, it can smell a kind of non-existent smell, such as burnt rice or burnt rubber and other smells. 7, hemiplegia or staggering gait: cerebellar lesions are more specific, i.e., patients often have cerebellar ataxia, hemiplegia or staggering drunken gait after headache, vomiting and visual impairment. 8, tinnitus, deafness: this kind of is more often found on the phone, that is, one ear can hear, the other ear can not hear. This performance is the precursor of acoustic neuroma. Gigantism: mostly seen in pituitary tumor. It is manifested as the patient’s rapid growth and the emergence of acromegaly (big chin, big nose, hypertrophy of lips and tongue, abnormally large hands and feet). 10.Growth and developmental arrest in young children: common in craniopharyngioma. The clinical manifestation is that the figure of 15 or 16 years old is only 5 or 6 years old, the sexual characteristics are not developed, and the belly is full of fat. To sum up, brain tumor has various manifestations, so when the above signs appear, one should go to the hospital for detailed examination quickly. At present, electronic computed tomography (CT) and magnetic resonance imaging (MRI) and intensive scanning can make early and definite diagnosis of brain tumor.