
The responsiveness of an organism to changes in its immediate environment.
— Richard L. Gregory
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.
The quality of being irritable or of responding to a stimulus.

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| ICD-10 | R45.4 |
|---|---|
| ICD-9 | 799.2 |
Irritability is an excessive response to stimuli. The term is used for both the physiological reaction to stimuli and for the pathological, abnormal or excessive sensitivity to stimuli; It is usually used to refer to anger or frustration.
Irritability may be demonstrated in behavioral responses to both physiological and behavioral stimuli including environmental, situational, sociological, and emotional stimuli.
Irritability can occur in people experiencing any of a variety of conditions, including:
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