Anti – NMDA Receptor Encephalitis, also known as NMDA Receptor Antibody Encephalitis is a condition in which the brain undergoes a state of acute inflammation, which can transform into something lethal if not given the proper treatment. Accurate treatment and precautionary measures can help the patient recover from the situation. The attacks comes from the immune system and the N – methyl D – aspartate receptor, NMDA is the target. Specifically, the immune system attacks the NR1 subunit of NMDA. A minimum number of cases get incorporated with tumours, teratomas of the ovaries, to be precise. Preliminary symptoms include headache, an upper respiratory infection and an illness synonymous to flu. Prodromal symptoms vary at different rates executing a number of neurological symptoms.