state of excitability

See: ardor
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By undue action, development and concentration, the brain begets upon the system and character a high state of excitability and inflammation often resulting in later life, and sometimes in middle age, in the condition of softening of the brain.
The symptoms of hyperthyroidism are; a high state of excitability, intolerance to heat, increased sweating, mild to extreme weight loss, varying degrees of diar- rhea, muscle weakness, nervousness or psychic disor- ders, extreme fatigue but inability to sleep, and tremor of the hands.
It's a chimera, nature's biggest E number, an unnatural, heightened state of excitability, like being under the influence of a drug.