On the permission for the sick person to say, "I have a pain" or "a terrible pain", "I have a fever" or "O my head!"

Riyad as-Salihin (The Meadows of the Righteous)

by Imam Nawawi

149. Chapter: On the permission for the sick person to say, "I have a pain" or "a terrible pain", "I have a fever" or "O my head!" and the clarification that that is not disliked if it is not due to exasperation

914. Ibn Mas'ud said, "I visited the Prophet, may Allah bless him and grant him peace, and he had a fever. I touched him and said, 'You have a very high fever.' He said, 'Yes, I have the fever of two of you.'" [Agreed upon]

915. Sa'd ibn Abi Waqqas said, "The Messenger of Allah, may Allah bless him and grant him peace, came to visit me in the year of the Hajj of Farewell on account of a serious illness I had. I said, 'Messenger of Allah, this illness has affected me as you see and I have property and no heirs except my daughter.'" [Agreed upon]

916. Al-Qasim ibn Muhammad said, "'A'isha said, 'O my head!' and the Prophet, may Allah bless him and grant him peace, said, 'On the contrary, "O my head!"'" [al-Bukhari]