| Location | Possible Causes | |----------|----------------| | Chest | Pericarditis (worse lying down), pneumothorax, rib fracture, panic attack | | Abdomen | Renal colic, bowel perforation (then becomes dull later), acute pancreatitis | | Head | Trigeminal neuralgia, occipital neuralgia, thunderclap headache (SAH until proven) | | Limb | Peripheral neuropathy, arterial embolism, complex regional pain syndrome | | Back | Vertebral compression fracture, epidural abscess, acute disc herniation |