Herpes simplex encephalitis (HSE) is a serious condition caused by the herpes simplex virus (HSV). The condition affects the brain, and if left untreated, it can result in neurological damage or even death. There are a few synonyms for HSE, including viral encephalitis, herpes encephalopathy, and HSV encephalitis. These terms refer to the same condition and are used interchangeably in medical circles. HSE can be difficult to diagnose, as its symptoms are often similar to those of other neurological conditions. It is important to seek medical attention if you suspect you may have HSE or any other neurological condition to receive prompt treatment and prevent any potential complications.