The majority of surgical procedures performed every day in the globe need the use of general anaesthesia. Patients who need general anaesthesia tend to be elderly (often 65 and more). Delirium refers to a state of extreme and rapid mental disorientation. A abrupt shift in cognitive ability is what this term describes. Both agitation and sleepiness, or even a mix of the two, might result from this. Following anesthesia-related surgery, it is common for elderly people to have temporary cognitive impairment. Patients may be suffering from post-operative delirium if they have a severe decline in mental state, such as confusion, disorientation, chronic drowsiness, hallucinations, agitation, or violence.