The Holy Quran, Cure for All Ailments

The Holy Quran contains cure for all ailments, physical and spiritual.
“We sent down in the Quran that which is a cure and mercy for the faithful”. (17:82)
“Say: for those who have faith, it (Quran) is guidance and healing; but as for those who are faithless, there is deafness in their ears and it is lost to their sight”. (41:44)
The Holy Prophet (P.B.U.H&H.P) has said:
“The healing of my Ummah lies in three things: A verse from the book of Allah, eating honey and Cupper lancet”. (Aamaali of Shaykh Sadooq)
A man came once complained about the pain in his chest. The Holy Prophet (P.B.U.H&H.P) said, “Seek healing from the Quran for Allah says: ‘It is a healing for what is in the breasts’”. (Uddah al-Daee)

The greatness of Quran
The commander of the faithful (A.S) said:
“Then Allah sent to him the Book as a light whose flames cannot be extinguished, a lamp whose gleam does not die, a sea whose depth cannot be sounded, a way whose direction does not mislead, a ray whose light does not darken, a separator (good from evil) whose arguments do not weaken, a clarifier whose foundations cannot be dismantled, a cure which leaves no apprehension for disease…Allah has made it a quencher of the thirst of the learned, a bloom for the hearts of religious jurists, a highway for the ways of the righteous, a cure after which there is no ailment…” (Nahjul-Balaghah) 
In another sermon, Imam Ali (A.S) also said regarding Quran:
“Seek cure from it (Quran) for all your ailments and seek its assistance in your distresses. For verily it contains cure for the biggest diseases namely: unbelief, hypocrisy, revolt and misguidance”.

Reference: Almahdi.org