There is a similar question here from 2012 (Do we want a disclaimer on the sidebar that we cannot offer medical advice?) where it was "accepted" that we don't want a disclaimer on the sidebar, but I am asking should we have one?
If you look at Health.SE, they have a disclaimer which I propose to have ourselves, adjusted to our requirements.
I have just noticed there is a link on educational purposes only. This leads to the following:
The information, advice, links and/or any other materials (“Content”) made available through Health Stack Exchange (the “Site”) are for informational purposes only and are not a substitute for professional medical advice, diagnosis, treatment or consultation. You should contact a qualified licensed medical provider to obtain advice with respect to any important medical issue or problem. Do not disregard or delay in obtaining professional advice based on any Content from the Site. Content may not be complete, correct, or up to date, and some Content may be obtained or provided without proper citation or review. Content made available through the Site does not represent endorsements or recommendations by Stack Exchange or other users. Use of and access to the Site or any Content on the Site, or any of the e-mail, website, social media or other like links contained within the Site, do not create an doctor-patient relationship between those posing or responding to inquiries, or any other users, even if licensed individuals in the corresponding fields are involved in such use. Further, these are not privileged communication, and no right to privacy exists. Any opinions expressed are the opinions of the individual author and may not reflect the opinions of Stack Exchange, or other users. All users of the Site relinquish any or all claims against Stack Exchange, the party providing the Content, and any other users that may arise from reliance on any information obtained from the Site. Reliance on any information appearing on the Site is solely at your own risk.