The description is usually of deep, constant, and poorly localized pain out of proportion with the findings on physical examination (often incorrectly described as pain out of proportion to the injury). The pain is aggravated by passively stretching the muscle group within the compartment or actively flexing it (though this finding is not specific to compartment syndrome alone) and is not relieved by analgesia up to and including morphine. Paresthesia (altered sensation e.g., "pins & needles") in the cutaneous nerves of the affected compartment is another typical sign.