Symptoms that may occur when brain tumor grows on the left side include symptoms of increased intracranial pressure, neurological dysfunction, epilepsy and so on. 1. Symptoms of increased intracranial pressure: as the volume of cranial cavity is certain, the increasing size of intracranial tumor can cause increased intracranial pressure and a series of symptoms, such as severe headache, projectile vomiting, blurred vision and so on, and in serious cases, it can cause cerebral hernia and lead to death of patients. 2. Symptoms of neurological dysfunction: left side brain tumor can cause corresponding neurological dysfunction when it destroys the brain functional area, for example, damage to the left anterior gyrus motor center can cause right hemiparesis, left occipital lobe invasion can cause hemianopsia, damage to language center can cause aphasia and so on. 3. Epilepsy: Brain tumor squeezing the normal brain tissue can cause epileptic seizure, which is manifested as sudden limb convulsions, loss of consciousness, foaming at the mouth and so on. Patients suspected of having left-sided brain tumor are recommended to go to the hospital as soon as possible to get a clear diagnosis in time and be treated accordingly, do not delay, so as to avoid the progression of the disease.