No visitors are allowed on adult inpatient wards at both Stoke Mandeville and Amersham hospitals because of the risk of norovirus.
Bucks Healthcare Trust says the move - which will be reviewed every day - is a "preventative measure" to limit the potential risk of norovirus infection.
Norovirus, also called the "winter vomiting bug", is a stomach bug that causes vomiting and diarrhoea.
The Trust says no visitors can attend inpatients on adult wards unless there are "exceptional circumstances" which have been agreed in advance by senior ward staff.
Those planning to visit are urged to call the hospital before setting off in case you are not allowed in.
The restrictions do not apply to Wycombe Hospital or children's wards at Stoke Mandeville.
The main symptoms of norovirus are:
- feeling sick (nausea)
- diarrhoea
- being sick (vomiting)
You may also have:
- a high temperature of 38C or above
- a headache
- aching arms and legs
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