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inability to sleep (insomnia, sleeplessness, primary insomnia, wakefulness)
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incoordination (ataxia, dyssynergia, ataxy, clumsiness)
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injury to the head (head injury, concussion, closed head injury, brain injury, traumatic brain injury)
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insect bites and stings (head injury, concussion, closed head injury, brain injury, traumatic brain injury)
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insomnia (sleeplessness, primary insomnia, wakefulness, inability to sleep)
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institutional abuse (abuse, elder, elder abuse, domestic abuse)
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involuntary shaking (trembling, tremor)
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irregular heartbeat (palpitations, arrhythmia)
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irritability in adults (palpitations, arrhythmia)
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irritability in children (palpitations, arrhythmia)
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itching (pruritis)
