Webster's New World Medical Dictionary

Paget’s disease of the breast
See 
breast,
Paget’s disease of.
Pagon syndrome
Congenital anemia with spin-
ocerebellar ataxia (wobbliness) that becomes
apparent by age 1. The anemia is characterized by
sideroblasts (iron-rich precursors of red blood
cells) seen on a blood smear. The syndrome is
inherited in an X-linked recessive manner and is
due to mutation in the ABC gene that encodes a pro-
tein that localizes to the mitochondrial inner mem-
brane and is involved in iron homeostasis. Also
known as “anemia, sideroblastic, and spinocerebel-
lar ataxia,” or ASAT. See also 
anemia.
pain
A sensation that can range from mild, local-
ized discomfort to agony. Pain has both physical and
emotional components. The physical part of pain
results from nerve stimulation. Pain may be con-
tained to a discrete area, as in an injury, or it may be
more diffuse, as in disorders such as fibromyalgia.
Pain is mediated by specific nerve fibers that carry
the pain impulses to the brain. See also 
pain
management.
pain, abdominal
See 
abdominal pain.
Pp
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pain, back
Pain in any part of the back. Pain in
the back can relate to the bony spine, discs between
the vertebrae, ligaments around the spine and discs,
spinal cord and nerves, muscles of the back, inter-
nal organs, or skin covering the back. Causes of
back pain can include injury, overstress, or disease.
pain, chest
See 
chest pain.
pain, knee
Pain in the knee. Causes of knee pain
include injury, degeneration, arthritis, infection
(infrequently), and, rarely, bone tumors.