What does the Quran say about illness and healing?

ٱلَّذِينَ إِذَآ أَصَٰبَتْهُم مُّصِيبَةٌۭ قَالُوٓا۟ إِنَّا لِلَّهِ وَإِنَّآ إِلَيْهِ رَٰجِعُونَ

Who, when disaster strikes them, say, "Indeed we belong to Allah, and indeed to Him we will return."

أَيَّامًۭا مَّعْدُودَٰتٍۢ ۚ فَمَن كَانَ مِنكُم مَّرِيضًا أَوْ عَلَىٰ سَفَرٍۢ فَعِدَّةٌۭ مِّنْ أَيَّامٍ أُخَرَ ۚ وَعَلَى ٱلَّذِينَ يُطِيقُونَهُۥ فِدْيَةٌۭ طَعَامُ مِسْكِينٍۢ ۖ فَمَن تَطَوَّعَ خَيْرًۭا فَهُوَ خَيْرٌۭ لَّهُۥ ۚ وَأَن تَصُومُوا۟ خَيْرٌۭ لَّكُمْ ۖ إِن كُنتُمْ تَعْلَمُونَ

[Fasting for] a limited number of days. So whoever among you is ill or on a journey [during them] - then an equal number of days [are to be made up]. And upon those who are able [to fast, but with hardship] - a ransom [as substitute] of feeding a poor person [each day]. And whoever volunteers excess - it is better for him. But to fast is best for you, if you only knew.

وَإِذَا سَأَلَكَ عِبَادِى عَنِّى فَإِنِّى قَرِيبٌ ۖ أُجِيبُ دَعْوَةَ ٱلدَّاعِ إِذَا دَعَانِ ۖ فَلْيَسْتَجِيبُوا۟ لِى وَلْيُؤْمِنُوا۟ بِى لَعَلَّهُمْ يَرْشُدُونَ

And when My servants ask you, [O Muhammad], concerning Me - indeed I am near. I respond to the invocation of the supplicant when he calls upon Me. So let them respond to Me [by obedience] and believe in Me that they may be [rightly] guided.

وَإِن يَمْسَسْكَ ٱللَّهُ بِضُرٍّۢ فَلَا كَاشِفَ لَهُۥٓ إِلَّا هُوَ ۖ وَإِن يَمْسَسْكَ بِخَيْرٍۢ فَهُوَ عَلَىٰ كُلِّ شَىْءٍۢ قَدِيرٌۭ

And if Allah should touch you with adversity, there is no remover of it except Him. And if He touches you with good - then He is over all things competent.

يَٰٓأَيُّهَا ٱلنَّاسُ قَدْ جَآءَتْكُم مَّوْعِظَةٌۭ مِّن رَّبِّكُمْ وَشِفَآءٌۭ لِّمَا فِى ٱلصُّدُورِ وَهُدًۭى وَرَحْمَةٌۭ لِّلْمُؤْمِنِينَ

O mankind, there has to come to you instruction from your Lord and healing for what is in the breasts and guidance and mercy for the believers.

وَإِن يَمْسَسْكَ ٱللَّهُ بِضُرٍّۢ فَلَا كَاشِفَ لَهُۥٓ إِلَّا هُوَ ۖ وَإِن يُرِدْكَ بِخَيْرٍۢ فَلَا رَآدَّ لِفَضْلِهِۦ ۚ يُصِيبُ بِهِۦ مَن يَشَآءُ مِنْ عِبَادِهِۦ ۚ وَهُوَ ٱلْغَفُورُ ٱلرَّحِيمُ

And if Allah should touch you with adversity, there is no remover of it except Him; and if He intends for you good, then there is no repeller of His bounty. He causes it to reach whom He wills of His servants. And He is the Forgiving, the Merciful

قَالَ إِنَّمَآ أَشْكُوا۟ بَثِّى وَحُزْنِىٓ إِلَى ٱللَّهِ وَأَعْلَمُ مِنَ ٱللَّهِ مَا لَا تَعْلَمُونَ

He said, "I only complain of my suffering and my grief to Allah, and I know from Allah that which you do not know.

ثُمَّ كُلِى مِن كُلِّ ٱلثَّمَرَٰتِ فَٱسْلُكِى سُبُلَ رَبِّكِ ذُلُلًۭا ۚ يَخْرُجُ مِنۢ بُطُونِهَا شَرَابٌۭ مُّخْتَلِفٌ أَلْوَٰنُهُۥ فِيهِ شِفَآءٌۭ لِّلنَّاسِ ۗ إِنَّ فِى ذَٰلِكَ لَءَايَةًۭ لِّقَوْمٍۢ يَتَفَكَّرُونَ

Then eat from all the fruits and follow the ways of your Lord laid down [for you]." There emerges from their bellies a drink, varying in colors, in which there is healing for people. Indeed in that is a sign for a people who give thought.

وَنُنَزِّلُ مِنَ ٱلْقُرْءَانِ مَا هُوَ شِفَآءٌۭ وَرَحْمَةٌۭ لِّلْمُؤْمِنِينَ ۙ وَلَا يَزِيدُ ٱلظَّٰلِمِينَ إِلَّا خَسَارًۭا

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.

۞ وَأَيُّوبَ إِذْ نَادَىٰ رَبَّهُۥٓ أَنِّى مَسَّنِىَ ٱلضُّرُّ وَأَنتَ أَرْحَمُ ٱلرَّٰحِمِينَ

And [mention] Job, when he called to his Lord, "Indeed, adversity has touched me, and you are the Most Merciful of the merciful."

فَٱسْتَجَبْنَا لَهُۥ فَكَشَفْنَا مَا بِهِۦ مِن ضُرٍّۢ ۖ وَءَاتَيْنَٰهُ أَهْلَهُۥ وَمِثْلَهُم مَّعَهُمْ رَحْمَةًۭ مِّنْ عِندِنَا وَذِكْرَىٰ لِلْعَٰبِدِينَ

So We responded to him and removed what afflicted him of adversity. And We gave him [back] his family and the like thereof with them as mercy from Us and a reminder for the worshippers [of Allah].

وَإِذَا مَرِضْتُ فَهُوَ يَشْفِينِ

And when I am ill, it is He who cures me

وَٱذْكُرْ عَبْدَنَآ أَيُّوبَ إِذْ نَادَىٰ رَبَّهُۥٓ أَنِّى مَسَّنِىَ ٱلشَّيْطَٰنُ بِنُصْبٍۢ وَعَذَابٍ

And remember Our servant Job, when he called to his Lord, "Indeed, Satan has touched me with hardship and torment."

ٱرْكُضْ بِرِجْلِكَ ۖ هَٰذَا مُغْتَسَلٌۢ بَارِدٌۭ وَشَرَابٌۭ

[So he was told], "Strike [the ground] with your foot; this is a [spring for] a cool bath and drink."

وَوَهَبْنَا لَهُۥٓ أَهْلَهُۥ وَمِثْلَهُم مَّعَهُمْ رَحْمَةًۭ مِّنَّا وَذِكْرَىٰ لِأُو۟لِى ٱلْأَلْبَٰبِ

And We granted him his family and a like [number] with them as mercy from Us and a reminder for those of understanding.

مَآ أَصَابَ مِن مُّصِيبَةٍ إِلَّا بِإِذْنِ ٱللَّهِ ۗ وَمَن يُؤْمِنۢ بِٱللَّهِ يَهْدِ قَلْبَهُۥ ۚ وَٱللَّهُ بِكُلِّ شَىْءٍ عَلِيمٌۭ

No disaster strikes except by permission of Allah. And whoever believes in Allah - He will guide his heart. And Allah is Knowing of all things.