Prophet sallallahu alaihi wa sallam said, "There is no disease that Allah has created, except that He also has created its treatment."
Bukhari 7.582

And indeed We have put forth every kind of example in this Qur'an, for mankind. But, man is ever more quarrelsome than anything.
Quran 18:54

"Allah taala jis ko chahta hai behisaab rozi deta hai aur jis ko chahta hai tangi karta hai."
Qur'an 13.26

Huzur sallallahu alaihi wa sallam ne farmaya joh khud apna galaa ghontle woh dozaki hain,joh khud apne neza mare woh dozaki hain.
Bukhari