Developing a healthcare app can be fraught with hidden costs, such as regulatory compliance, data security, and integration with existing systems. Other unexpected expenses include user training, ongoing maintenance, scalability issues, and obtaining certifications. To avoid these pitfalls, thorough planning and budgeting are essential. Engage experienced developers, prioritize user feedback, and ensure continuous testing. Stay updated with industry regulations and invest in scalable infrastructure. By addressing these factors early, you can mitigate hidden costs and ensure a successful app launch.