Dua for any and every disease

Allâhumma rabban-nâsi adhhibil-ba’sa washfi antash-shâfi lâ shifâ-a illâ shifâ’uka, shifâ-an lâ yughadiru saqamn.

O Allah, Lord of the people, remove all harm, give cure, for you are the one who cures. There is no curing except Your curing - a curing that leaves no illness (Bukhari)