IF you think something is wrong, go see your doctor. Explain that you are worried it is a brain tumor. Keep in mind that brain tumors are relatively rare compared to most other disorders, so the primary care doctor is not usually going to be thinking it is a brain tumor. They first think of more common causes of the symptoms. Sixty-four percent of the time, the doctor thought it was NOT a brain tumor when respondents first went to the doctor. More than half of the people reported that they had the symptoms for more than a month before the correct diagnosis of brain tumor was made. With the malignant brain tumors, a delay of a month in starting treatment can make a major impact on the outcome.