The authors found bilateral hypersensitivity to capsaicin ( P 0.02 ) , skin fold ( P = 0.001 ) , joint pressure ( P < 0.0001 ) , cold ( P 0.01 ) , and heat pain ( P 0.04 ) in patients compared with that in controls and thermal and mechanical hyperalgesia in the complex regional pain syndrome-affected hand compared with that in the unaffected hand ( P 0.001 ) .