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As part the biggest strike action in more than 30 years, some hospitals say they're having to cancel some operations.
In Dorset, the NHS says it's trying to keep disruption to a minimum.
Chief executive of the NHS Dorset and NHS Bournemouth and Poole cluster is Paul Sly.
He said “A small number of staff have taken the decision to support a national day of action by union members on 30 November, however as an organisation the NHS carefully plans for possible disruption in any form to ensure we are able to meet the needs of patients, and we are confident we can continue to deliver the best healthcare to local people just like any other day.
We would however urge people to check with before setting off for appointments or check via the local NHS websites. Using the NHS services correctly is also very important. For example for minor ailments like runny nose or headache visit your local pharmacist, or for more persistent problems make an appointment with your GP rather than attend the local A&E; which should only be used for genuine emergencies”.
Those people who have existing appointments which may be affected by the action will be contacted to make alternative arrangements.