Samuel - I would argue that each of your identified topic areas (and you say not just limited to those) are huge. Public health, in itself, could potentially be almost any subject. Without you being a little more specific around each topic i.e. personal interests, previous experience, it would be a 'random' process to choose any particular suggestion for you.
Thank you for you respond. I have BSc and MSc in Soil Science. And I am currently undergoing another MSc in environmental Toxicology however of recent my interest grew toward public health. I am thinking of doing something that directly affects Human health.
And that was why I mentioned MSc that could lead to PhD. Maybe it is possible to do something related to environmental health for MSc then Public health related for PhD. Just thinking randomly that's why I'm seeking opinions
@SamuelAdegoke! Explore the use of audio technology in healthcare, more specifically the management of medical records and other documents through audio input, which helps relieve doctors and nurses of the burden of medical records and allows doctors to pay more attention to patients.