Congenital insensitivity to pain is an autosomal recessive genetic disease that formed due to a mutation on the SCN9A. This gene instructs the sodium channel that is on a nerve cell that transfers, to the brain and spinal cord, pain signals. Due to this mutation, the people born with this disease do not experience pain, though they can sense a difference between hot or cold and sharp or dull. Congenital insensitivity to pain is a dangerous disease because those infected are unaware of internal or external injuries because they do not experience the pain with them.
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