Patients with hyperprolactinemia often present with emotional difficul
ties. These occasionally persist even after successful treatment. Insi
ght into the roots of their diseased state makes a difference in the h
andling of all cases, but becomes crucial in the not-so-rare situation
s in which the normalization of hormonal levels is not followed by a f
eeling of cure. This chapter attempts to provide details, discuss and
situate in context the following blocks of pertinent information: (1)
prolactin acts upon the central nervous system and variations in its c
oncentrations do affect mood, emotions and behavior; (2) most actions
of prolactin are directed to metabolical and behavioral adaptation to
pregnancy and the care of the young; (3) even in the absence of pregna
ncy prolactin secretion responds to environmental stimuli under specif
ic conditions. Whether adaptive, as in the case of surrogate maternity
, or pathological, as in the case of pseudopregnancy, prolactin respon
ds to a perceived need to take care of a child; (4) the facts that the
clinical onset of prolactinomas often follows life-events and that th
ese tumors occur preferentially in women brought up under specific con
ditions suggest the possibility that psychological factors may predisp
ose to prolactinomas; (5) dealing with individual cases requires the p
erception that the relations between prolactin, emotions and feelings
are circular, i.e., prolactin affects the brain and mood but, on the o
ther hand, personality traits and environmental factors may stimulate
the secretion of prolactin and may play a role in the genesis of the d
isease.