A brain tumor is an overgrowth of abnormal cells in or close to the brain. Cancerous or malignant brain tumors tend to grow quickly. There are more than 120 different types of brain tumors. Symptoms of brain cancer vary depending on the tumor’s size and location and include headaches, nausea, vomiting, lack of coordination and balance, difficulty walking, speech and vision problems, personality changes, muscle jerking or twitch, numbness or tingling in the arms or legs and seizures.