Occupational Health may not be able to sign you off work, but they may play a role in ensuring that you are able to come back when you are completely better, and they may work to ensure that the workplace does not affect your health in a bad manner. Occupational health is a healthcare related position, but they play a different role when someone is on a leave long-term due to being sick, which means if they are away for four weeks or longer, and they are an enabler of sorts who help the employee come back to work instead of signing them off.