Understand your users' needs. After all, there's no point in building an app that nobody wants or needs.
User privacy and data security should also be a primary focus, ensuring your healthcare app adheres strictly to regulations like HIPAA.
Carefully consider your chosen technology stack for building the app and pay extra attention to creating a user-friendly design because healthcare is complex enough; your app shouldn't be.
Always remember that, in the end, your app should make healthcare more accessible and less perplexing, creating a burst of relief for the user.