Your doctor will only give you a Fit Note if your health affects your fitness for work.
You do not need a Fit Note from your doctor for seven days or less, because you can self-certify your leave for this time. Please see the following website for more information regarding this: https://www.gov.uk/government/publications/statutory-sick-pay-employees-statement-of-sickness-sc2
Rules of the Fit Note
You should get a Fit Note from the doctor who is treating you. This will usually be your GP, but if you are getting treatment post operatively in hospital you should ask for one from your hospital doctor.
The Fit Note is classed as advice from your doctor. Your employer can decide whether or not to accept it and your doctor cannot get involved in any disputes between you and your employer.
A Fit Note cannot be issued for a date in the future, however Fit Notes can be backdated if it is for a continuation of a previous Fit Note.
Going back to work
You should go back to work as soon as you feel able to and with your employer’s agreement – this may be before your Fit Note runs out. You do not need to go back to see your doctor before going back to work. Your doctor cannot give you a Fit Note stating that you are ‘fit for work’.