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Their are very few reasons for an adult to go into hypothermia spontaneously. His symptoms can be suggestive of shock which is leading to poor circulation
Can be due to septicemia (infection), cardiac failure , dehydration
or some vascular injury
. Most likely cause being septic shock
His heart rate , Blood pressure , pule volume, Respiratory rate
need to be checked immediately and needs Iv Fluids and drugs immediately.
Please take him to the ER immediately