Invocation (Dua'a) when you feel pain in your body

Put your hand on the place where you feel pain and say: Bismillaah. "With the Name of Allah' (three times).

Then say : 'A'oothu billaahi wa qudratihi min sharri maa 'ajidu wa 'uhaathiru. 'I seek refuge in Allah and in His Power from the evil of what I find and of what I guard against.'

[Reference: Muslim 4/1728. Fortress of the Muslim.]