The Holy Quran is the Sacred Book of Allah SWT revealed upon Prophet Muhammad ﷺ which contains highly blessed Verses serving as a guide for its readers in every matter concerning life. Since ignorance is the biggest form of sickness one could ever have, one can say that Quran Majeed proves as a remedy for this disease by making its interpreters able to know about the Almighty Lord`s commandments.
The Creator of the universe says:
“And We send down of the Qur'an that which is healing and mercy for the believers, but it does not increase the wrongdoers except in loss.” [Quran, 17: 82]
It means that by getting full knowledge of the instructions mentioned in Furqan e Hameed, one is able to rectify all its wrongdoings and attain righteous and success in all walks of life. Its understanding makes one to think and observe Allah`s signs in the entire universe. All the scientific researches that have been made so far are also according to the same notion of examining matters with conscious as mentioned in Quran Pak. Therefore, one can say that yes, the Holy Quran is a stepping stone to remedying all kinds of illnesses. The Holy Prophet ﷺ said:
"There is no disease that Allah has created, except that He also has created its treatment." (Al-Bukhari)
It means that every ailment has its cure. It’s up to humans how much effort they put into it to find the actual cause and healing factor for them.
Reported by Usamah ibn Shuraim (R.A):
“… ‘O Allah’s Messenger! Should we seek medical treatment for our illnesses?’ He replied: ‘Yes, you should seek medical treatment, because Allah, the Exalted, has let no disease exist without providing for its cure, except for one ailment, namely, old age’.” (Tirmidhi)
The above mentioned Hadith tells that one should take enough care in searching for the therapy of disease before it gets worse.
In addition to that, there are certain Surahs and Ayats in Quran Kareem which are actually mentioned in the Prophetic (PBUH) traditions to have been used by Rasulullah ﷺ Himself as curative means.
Narrated by Hazrat A`ishah (R.A):
"When a member of the Prophet's family got ill, the Prophet would blow over his body by reciting the two protective surahs (Al-Falaq and An-Nas, 113 and 114 respectively) and would rub him with his hand." (Muslim)
It shows that the Hazrat Muhammad ﷺ had a strong belief in Allah`s command over everything that is why He used to recite Surah Falaq and Nas which are great supplications to the Almighty asking Him for His Refuge against all kinds of evils.
Many religious scholars believe that the Holy Quran contains certain Verses and Duas (Prayers) which act as a Ruqayya meaning “a request for a cure from ailments” in front of the Most Merciful. These include Chapters of Al-Fatihah, Al-Falaq and An-Nas.
Abu Khuzamah (R.A) related:
“I said, ‘O Messenger of AIIah m, about the Ruqya (divine remedies – Islamic prayer formula) that we use, the medicine we take and the prevention we seek, does aII this change AIIah’s appointed destiny?’ He said, ‘They are a part of AIIah’s appointed destiny. (Ahmad)
It means that one can change its fate by praying to Allah SWT for His Complacency in removing pain and diseases, even if it is facing serious forms of sickness.
So, to conclude, the recitation of Quran does actually serves as a cure for every illness as it contains many Ayats and Surahs of the Quran which are supplications to the Gracious God and it also guides one to look for solutions of its own problems through observation.