- The quality or state of being irritable; testiness or petulance.
- Pathology. Abnormal or excessive sensitivity of a body organ or part to a stimulus.
- Physiology. The capacity to respond to stimuli.
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The responsiveness of an organism to changes in its immediate environment.
1. ability of an organism or a specific tissue to react to the environment.
2. the state of being abnormally responsive to slight stimuli, or unduly sensitive.
Irritability is an excessive response to stimuli. Irritability takes many forms, from the contraction of a unicellular organism when touched, to complex reactions involving all the senses of higher animals. In plants, response is usually different from that seen in animals, but is nonetheless present. The term irritability is used for both the physiological reaction to stimuli and for the pathological, abnormal or excessive sensitivity to stimuli.
Irritability may manifest in behavioral responses to both physiological as well as behavioral stimuli, including environmental, situational, sociological, and emotional stimuli.
Irritability can result from conditions such as:
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