Attributing diseases to contagion and heredity and its relationship to tawhid (the oneness of Allah)

Question:
Honorable Shaykh, Sultan asks: Do some doctors look at a disease and say that you have contracted it due to heredity? Is that considered ignorance, or is it obligatory to believe that nothing happens except by the permission of Allah the Exalted?

Answer:
Allah knows best. Diseases differ; some are contagious by the permission of Allah, and some are contracted through heredity. All of it is by the permission of Allah, Mighty and Majestic. This does not conflict with the fact that Allah, Glorified and Exalted is He, created this disease and made some of it spread from the sick person to others through contagion or heredity. Therefore, this is not considered shirk (associating partners with Allah) or claiming knowledge of the unseen or the like, if it is established medically and determined medically. The Messenger (peace and blessings be upon him) said: and he said: So contagion exists, but it is not permissible to believe that it spreads by itself; rather, it is by the command of Allah, Subhanahu wa Ta'ala, His decree and divine decree. As for in the pre-Islamic age of ignorance (jahiliyyah), they believed that contagion spreads by itself and did not attribute this to Allah, Subhanahu wa Ta'ala. Yes.