In The Name of Allaah, The Most Merciful, The Bestower of Mercy.

Allaah [The Most High] stated that Ibraaheem [alayhis salaam] said: [وَإِذَا مَرِضۡتُ فَهُوَ يَشۡفِينِ – And when I am ill, it is He [Allaah] Who cures me. [Surah Ash-Shu’araa. Aayah 80] – Meaning: When I become sick, none is able to heal me, except Him through the means that may lead to recovery [i.e. by His Will]. [R 1]

The Messenger [sallal laahu aalayhi wasallam] said, “Treat your sick by giving Sadaqah”. [R 2] AbuBakr Al-Khubaaziy [rahimahullaah] said, “I had a very dangerous illness, so a neighbour of mine saw me and said, ‘Act upon the statement of Allaah’s Messenger [sallal laahu alayhi wasallam], ‘Treat your sick by giving Sadaqah’. It was summertime, so I bought many watermelons and gathered a group of poor people and children. They ate and then supplicated for me to be cured. By Allaah! I did not reached the next morning except that Allaah granted me wellbeing’”. [R 3]

As for the diseases of the body, Allaah [The Most High] said: [لَّيۡسَ عَلَى ٱلۡأَعۡمَىٰ حَرَجٌ۬ وَلَا عَلَى ٱلۡأَعۡرَجِ حَرَجٌ۬ وَلَا عَلَى ٱلۡمَرِيضِ حَرَجٌ۬ – There is no restriction on the blind, nor any restriction on the lame, nor any restriction on the sick….. [24:61]

[Also] Allaah mentioned the diseases of the body when He [The Most High] spoke about Hajj, Fasting and Ablution due to a marvellous underlying reason – a reason that will reveal to you the Greatness of the Qur’aan and suffices the one who understands it. The principles of physical medicine are three: preservation of health, protecting [the body] from what might cause harm and removal of harmful substances [from the body]; and Allaah [Glorified be He and free is He from all imperfections] mentioned these three principles in those three places [i.e. when He (The Most High) spoke about Hajj, Fasting and Ablution)] [Ref 4]

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R 1: Tafseer Ibn Katheer

[R 2: Hadeeth declared Hasan by Imaam Albaani [rahimahullaah] in Saheeh Al-Jaami As-Sagheer Wa Ziyaadah 3358

R 3: Siyar A’laam An-Nubulaa 18/44

R 4: An Excerpt from At-Tib An-Nabawiy of Imaam Ibnul Qayyim Al-Jawziyyah (rahimahullaah) with comments by Al-Allaamah Muhammad Haamid Al-Faqee (rahimahullaah): page: 3]