Source: The Great Interpretation of Dreams (Ibn Sirin)
A hospital in a dream indicates the removal of worries and recovery from illnesses. For the sick, it is recovery, and for the healthy, it is repentance.
Source: Perfuming Humanity in the Expression of Dreams (Al-Nabulsi)
A hospital indicates the house of the ruler or the judge. Entering it indicates seeking a need.
Source: Signs in the Science of Expressions (Ibn Shaheen)
A hospital is interpreted as relief. Whoever sees himself entering it, God will relieve his worry.