The nervous system consist of certain cells and their function is to transmit and receive informations that relates to the organism an it its environment. By processin this information, the nervous system stimulates reactions in other parts of the bodysuch as the coordinations of muscle contractions, and the secretion of glands with internal and external secretion. It is divided into: central and peripheral nervous system and somatic and vegetative nervous system. Brain tumors are abnormal growts in the brain and are divided into glial and non-glia tumors. The most common symptoms of brain tumors are: headache, nausea and vomitin, and visual disturbances. If a neurological examination suspect a pathological process in the head, the patient should have a CT or MRI of the brain. Treatment for brain tumors usually consist of radical tumor resection and chemotherapy. After brain tumor surgery, the patient is- transferred to the neurosurgical intensive care unit where he remains postoperatively for 48 – 72 h and this period is crucial for the patient´s recovery.The purpose of postoperative health care is to meet the basic human needs of the patient in accordance with his level of independence throught nursing diagnoses and prevention of possible nursing medical problems that occur during this period. Therefore, it is important to assess the patient's condition and draw a conclusion about the existence of the problem. The most common nursing problems postoperatively are: pain, reduced ability to care for themselves, reduced airway patency, decreased endurance, damage to the oral cavity, and constipation. Among the nursing medical diagnoses, there are: high risk for bleeding, high risk for infections and high risk for deep vein trombosis. In the postoperative period, the nurse must observe the patient´s vital functions, the patient's state of consciousness, monitor diuresis and encourage the patients drink enoughfluids, and document everything in the nurse's documentation. He must perform passive leg exercises in bed and encourage the patient to breathe and cough. The psyhological support of the nurse is very important for the patient to accept new situation, which can be transient and permanent. The nurse should allow the patient to visit the family as this plays a significant role in promoting the patient's recovery and progress.