I never saw anybody suffering so much from sickness as Allah's Messenger (ﷺ).
Sahih al-Bukhari Book 75, Hadith 6
← Previous Hadith Allah's Messenger (ﷺ) said, "If Allah wants to do good to somebody, He afflicts him with trials."

Sahih al-Bukhari Book 75, Hadith 5 Next Hadith → I visited the Prophet (ﷺ) during his ailments and he was suffering from a high fever. I said, "You have a high fever. Is it because you will have a double reward for it?" He said, "Yes, for no Muslim is afflicted with any harm but that Allah will remove his sins as the leaves of a tree fall down."

Sahih al-Bukhari Book 75, Hadith 7