When Dave's convoy was attacked in Iraq, he lost a leg. Months after he recovered from his injury, Dave continues to experience intense pain that seems to originate in his amputated leg. Dave is experiencing:

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Dave is experiencing phantom limb pain, which is a type of pain that is commonly reported by amputees. It occurs when the brain still receives signals from the nerves that previously served the amputated limb. These signals can be interpreted as pain, even though the limb is no longer there. It is believed that cortical reorganization in the brain may play a role in phantom limb pain.

When Dave's Convoy Was Attacked in Iraq, He Lost a Leg