Based on remarks by Plutarch, Caesar is sometimes thought to have suffered from epilepsy. Modern scholarship is sharply divided on the subject, and some scholars believe that he was plagued by malaria, particularly during the Sullan proscriptions of the 80s BC. Other scholars contend his epileptic seizures were due to a parasitic infection in the brain by a tapeworm.
Caesar had four documented episodes of what may have been complex partial seizures. He may additionally have had absence seizures in his youth. The earliest accounts of these seizures were made by the biographer Suetonius, who was born after Caesar died. The claim of epilepsy is countered among some medical historians by a claim of hypoglycemia, which can cause epileptoid seizures.
A line from Shakespeare’s Julius Caesar has sometimes been taken to mean that he was deaf in one ear: “Come on my right hand, for this ear is deaf.” No classical source mentions hearing impairment in connection with Caesar. The playwright may have been making metaphorical use of a passage in Plutarch that does not refer to deafness at all, but rather to a gesture Alexander of Macedon customarily made. By covering his ear, Alexander indicated that he had turned his attention from an accusation in order to hear the defence.
Francesco M. Galassi and Hutan Ashrafian suggest that Caesar’s behavioral manifestations – headaches, vertigo, falls (possibly caused by muscle weakness due to nerve damage), sensory deficit, giddiness and insensibility – and syncopal episodes were the results of cerebrovascular episodes, not epilepsy. Pliny the Elder reports in his Natural History that Caesar’s father and forefather died without apparent cause while putting on their shoes. These events can be more readily associated with cardiovascular complications from a stroke episode or lethal heart attack. Caesar possibly had a genetic predisposition for cardiovascular disease.