Due to an accident, I had to be in the hospital for two weeks.
Due to an accident, I had to be in hospital for two weeks.
In British English, use in hospital when someone is there as a patient: ‘She spent three days in hospital.’
Use the hospital when referring to a particular hospital or its building: ‘I went to the hospital to visit my sister.’
In American English, in the hospital is also correct when someone is there as a patient.
See SCHOOL