Allah has made it crystal clear that Quran is revealed in Arabic not for just Arabic audience, but a complete Hidayah and Shifah for believers. They are believers as they believe in it being the true word of Allah and hence read it as a guidance from Allah.

وَلَوْ جَعَلْنَـٰهُ قُرْءَانًا أَعْجَمِيًّۭا لَّقَالُوا۟ لَوْلَا فُصِّلَتْ ءَايَـٰتُهُۥٓ ۖ ءَا۬عْجَمِىٌّۭ وَعَرَبِىٌّۭ ۗ قُلْ هُوَ لِلَّذِينَ ءَامَنُوا۟ هُدًۭى وَشِفَآءٌۭ ۖ وَٱلَّذِينَ لَا يُؤْمِنُونَ فِىٓ ءَاذَانِهِمْ وَقْرٌۭ وَهُوَ عَلَيْهِمْ عَمًى ۚ أُو۟لَـٰٓئِكَ يُنَادَوْنَ مِن مَّكَانٍۭ بَعِيدٍۢ

Had We revealed it as a non-Arabic Quran, they would have certainly argued, “If only its verses were made clear ˹in our language˺. What! A non-Arabic revelation for an Arab audience!” Say, ˹O Prophet,˺ “It is a guide and a healing to the believers. As for those who disbelieve, there is deafness in their ears and blindness to it ˹in their hearts˺. It is as if they are being called from a faraway place.”

Quran: Surah Al-Fussilat [41:44 ] 

In the later part of the Ayah , the word used is شِفَآءٌۭ which refers to cure of different diseases both physical or spiritual. Spiritual ailments includes such as envy, selfishness, hypocrisy, etc. The Quran’s lessons teach people how to change their attitude and purify their hearts and souls of negativity and impurity. It is also critical to note that as per this surah, Quran is only beneficial to those who believe in it. If some one doesn’t believe in it will not get the benefits of guidance and healing from it.

One particular thing in the final part of the following Ayah is that if someone does not believe in the Quran then it is due to their own blindness to it, in their hearts and deafness in their hears. It is now up to you either you are ready to read, learn & act upon Quran to get both the Hidayah  & Shifah or refrain to get benefits from it. 

On another place similar words have been used where Quran mentions this as: شِفَآءٌۭ وَرَحْمَةٌۭ لِّلْمُؤْمِنِينَ (Healing and mercy for the believers). 

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

We send down the Quran as a healing and mercy for the believers, but it only increases the wrongdoers in loss. 
Quran: Surah Al-Isra [17:82]

Again two critical points mentioned; 

1. Quran will only beneficial for who believes in it
2. For those who don’t it, will only increase the loss, be it in this world or here after

These two surah’s conclude that interacting with Quran be it reading, memorizing, understanding and contemplating Quran is beneficial for curing physical, spiritual or psychological diseases leading toward a overall well being.