in DSM–IV–TR, an anxiety disorder characterized by recurrent, unexpected panic attacks that are associated with (a) persistent concern about having another attack, (b) worry about the possible consequences of the attacks, (c) significant change in behavior related to the attacks (e.g., avoiding situations, engaging in safety behavior, not going out alone), or (d) a combination of any or all of these.

a progressive neurodegenerative disease caused by the death of dopamine-producing neurons in the pars compacta region of the substantia nigra of the brain, which controls balance and coordinates muscle movement.

n. a rare eating disorder marked by a persistent craving for unnatural, nonnutritive substances, such as plaster, paint, hair, starch, or dirt.

n. a rare eating disorder marked by a persistent craving for unnatural, nonnutritive substances, such as plaster, paint, hair, starch, or dirt.

in DSM–IV–TR, a disorder that may result when an individual lives through or witnesses an event in which he or she believes that there is a threat to life or physical integrity and safety and experiences fear, terror, or helplessness.

a mood disorder in women that begins in the week prior to the onset of menstruation and subsides within the first few days of menstruation.

in DSM–IV–TR, a sleep disorder characterized by difficulty in initiating or maintaining a restorative sleep to a degree in which the severity and persistence of the sleep disturbance causes clinically significant distress, impairment in a significant area of functioning, or both.