Which surah is for healing?

Surah Al-Fatiha

The Holy Prophet (peace be upon him) referred to this chapter as the one meant for healing. Khwaja Nizamuddin Auliya provided guidance on how to recite this surah for the purpose of healing. He advised, "Recite the surah 40 times, ensuring that with each recitation, you connect the meem of 'Bismillah' to the laam of 'Alhamdulillah', and conclude by saying 'Ameen' three times."