Auditory neuroma is a type of brain tumor that grows in a corner between the cerebellar hemispheres and the brainstem of a person called the cerebellar horn of the pons. Although it is a benign tumor, it is still one of the more difficult procedures in brain surgery because of its deep growth site. However, if it can be diagnosed early, it is a different story. At this time, the tumor is small in size and has less adhesion to the surrounding important nerve tissues, so it is relatively easy to remove and clean. Not only the complications of surgery are less, but also the tumor will not recur. If it is in advanced stage, it is much more difficult to remove all the tumors, and there are many surgical complications and recurrence. This shows that early detection and diagnosis of auditory neuroma is very important. Mild deafness is the earliest and most easily noticed symptom of an auditory neuroma. Progressive deafness on one side is the hallmark of this disease. It is important to remember when seeking medical attention that if you have mild deafness, you also need to see a brain surgeon. Vertigo is another commonly noticed symptom. Many people think that vertigo is the cause of deafness and tinnitus, and then assume that vertigo is caused by “Ménière’s disease” or “high blood pressure”, and neglect further examination, which is a mistake. Of course, these diseases can also cause deafness, tinnitus and vertigo, so it is important to catch another characteristic of the symptoms of auditory neuroma, which is the progressive worsening of symptoms. Tinnitus is also a common symptom. Some people describe it as a “whirring” sound of the wind blowing in the ears. It’s louder when you’re quiet, but inaudible when you’re working. It can be persistent or paroxysmal. As the tumor grows, due to the difference in its location and growth pattern, in addition to the above symptoms, some patients walk with a wobbly and wide stride, looking like they are drunk, and are especially afraid of standing upright with their feet together. They seem to be very clumsy and slow in tying shoelaces, buttoning and writing. By this time, the tumor usually has grown to 2 cm in diameter and invaded the cerebellar hemispheres. In addition, some patients will first develop facial nerve paralysis or pain on one side, or facial twitching. All these symptoms appear one after another because the tumor keeps growing and invades the adjacent brain nerves. When patients develop headache, vomiting and vision loss, the auditory neuroma has often grown very large and the disease has reached an advanced stage. It is worth pointing out that many patients only present to the brain surgery department at this time. Thus, it seems that the symptoms of mild deafness should never be taken lightly.