Explain what kind of state delirium really is? Delirium is an altered state of mind caused primarily by fever or infection following surgery. Traditionally, it is often referred to as delirium, a state of confusion, inability to recognize time and place, and babbling caused by a stimulus such as a fever or infection. If delirium occurs after surgery, how should it be treated? Clinically, there are not many such manifestations. If delirium does occur, I think the cause of the delirium should be treated first, such as fever or infection, and the temperature should be lowered to control the infection, and then psychotropic medication should be given to control the delirium.