I came to the Prophet (peace be upon him) and his companions were sitting as if they had birds on their heads [means the were sitting in attentive posture out of respect to the Prophet (peace be upon him)]. I saluted and sat down. The desert Arabs then came from here and there. They asked: Apostle of Allah, should we make use of medical treatment? He replied: "Make use of medical treatment, for Allah has not made a disease without appointing a remedy for it, with the exception of one disease, namely old age".

Dawud :: Book 28 : Hadith 3846