Hysteria refers to a disorder common in Freud's female patients in turn-of-the-century Vienna, characterized by a grab-bag of somatic symptoms: limb paralysis, motor automatisms, sensory deficits, atonia, etc.
Other /More definition:
Hysteria refers to a disorder occurring when psychological disturbances take a physical form and there is no physiological explanation, such as an unexplained paralysis of the arms or legs. This term has been replaced by conversion reaction in common usage.

Moreover, Hysteria is a kind of disorder in which psychological problems become expressed in physical form.
Other /More definition:
Hysteria refers to a disorder in which psychological problems become expressed in physical form.