Also found in: Medical.


Excessive response to a stimulus.

hy′per·ir′ri·ta·ble adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


excessively responsive or sensitive to a stimulus
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
References in periodicals archive ?
Local injury leads to an excessive release of acetylcholine and resultant increase in motor endplate activity to mediate the manifestation of a discrete, palpable, hyperirritable locus within the peripheral muscle.
Myofascial trigger points (MTrPs) are hyperirritable spots in a palpably taut band of skeletal muscle in humans.
A myofascial "Trigger Point" (TP) is a hyperirritable point in skeletal muscle that is associated with a hypersensitive palpable nodule or "knot." Myofascial Pain Syndrome (MPS) is caused by myofascial Trigger Points (TPs) located within taut bands of skeletal muscle fibres.
Pain is caused by disturbance of myofascial trigger points (TPs), which are hyperirritable spots in skeletal muscle or in the fascia associated with skeletal muscle.
MMJ Labs LLC, a maker of personal pain control solutions, has received Food and Drug Administration approval for VibraCool, a wearable device designed to provide relief for muscle aches, injuries and myofascial trigger points, or hyperirritable spots in the fascia surrounding skeletal muscles.
Myofascial pain syndrome is a painful musculoskeletal condition initiated from the hyperirritable spot within a taut band of skeletal muscle.
Abdominal myofascial pain syndrome, characterized by hyperirritable trigger points is another frequent under-diagnosed condition causing CPP, especially in countries where the prevalence of cesarean section and other abdominal surgeries is common (3).
During an asthma episode, the walls of the airways become inflamed and swollen causing narrowing or "bronchoconstriction." This occurs because asthmatic airways are "hyperreactive" or "hyperirritable," and react easily upon contact with various triggers.
Myofascial trigger points are defined as hyperirritable points located in taut bands of skeletal muscle or fascia which when compressed cause local tenderness and/or referred pain (Simons 2002, Tough et al 2009, Yap 2007).
Myofascial pain syndrome (MPS) is a musculoskleteral pain disorder characterized by pain caused by hyperirritable spots, defined as trigger points (TP), in one or more taut bands of muscle fibers.
ACUPUNCTURE POINTS AND TRIGGER POINTS: Traditional Chinese acupuncture points are stimulated by a focused laser beam, used solely or in combination with acupuncture needles, to produce a systemic effect; high doses of laser therapy may be used to deactivate trigger points (hyperirritable spots that induce pain elsewhere in the body) found in muscle, ligaments, tendons, and periosteum.
Myofascial Trigger Points are described by Travell and Simons1 as hyperirritable loci within a taut band of skeletal muscle or the fascia that surrounds it.