Several things: Multiple possibilities: including hyperthyroidism and also drug abuse involving stimulants like methamphetamine. Sometimes opiates like heroin if the person is not getting a steady supply. Also severe agitated depression, and some anxiety disorders. Have seen some psychoses be like this also -- schizophrenia & mania. The person may not feel eating is necessary, or hyperactivity is extreme.
Answered 5/7/2016
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