Public health ethics grapples with balancing individual rights and collective well-being. Key principles include respect for persons, beneficence, justice, and autonomy. Historical events like the Nuremberg Code and HIV/AIDS epidemic have shaped ethical frameworks in this field. Professional conduct in public health emphasizes acting in the public interest, maintaining competence, and collaborating across sectors. Real-world cases like the Flint water crisis highlight ethical challenges. Ongoing issues include health inequities, industry influence, and privacy concerns in the digital age.