Glioblastoma multiforme is a type of astrocytoma that is generally considered to be the most malignant of its kind. It is also one of the highest grades of glioma tumors, and it causes many of the same effects as brain tumors. Patients with glioblastoma multiforme may experience erratic heartbeat, frequent headaches, nausea and vomiting, walking and speaking difficulties, dizziness, vision problems, and seizures. For these and many other symptoms of the condition, the use of marijuana may be beneficial. Marijuana is especially useful for patients who feel nauseous because of the condition.