Neurosis

Definition

A general term applied to mental or emotional disturbance in which, as opposed to psychosis, there is no serious disturbance in the perception or understanding of external reality. However, the boundaries between neurosis and psychosis are not always clearly defined. 

Source: Black's Medical Dictionary (42nd ed, 2010, ISBN 978-1-4081-0419-4)

Neuroses are usually classified into anxiety neuroses, depressive neuroses, phobias (see phobia), hypochondriasis, hysteria and obsessional neuroses.