Question: What is the significance of Bourne's and The Professor's headaches? The Professor might have explained it just after he mentioned them, but I didn't catch what he said.
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Chosen answer: It's something to do with the conditioning that the Treadstone agents go through. The precise cause isn't clear. It is mentioned more in the sequels, but not to any great extent - either PTSD or medication seems to be the root of it.
Tailkinker ★