Your question is great.
Healing of every sickness is also a disease of the soul.
Body diseases too.
but how.
When we understand the Qur'an and then we do our own research. We combine the information of the Quran with the spiritual and the scientific. So inside of us is the disease of the soul. She starts to go away. Because this book is the truth. And there is every spirituality in it.
And when the spiritual sickness is cured. So man can feel very good.
And then when we read the Holy Scriptures for the cure of a physical illness, its effectiveness is cured of many diseases.
I will write a post on this very soon.