Needs change. The patient goes home, the goal is covered, or you need a break. You choose what happens to your page.
Open your fundraiser while signed in. In the Your fundraiser row, tap Pause or end… and pick one. You can add a short note that visitors will see.
The page stays up, and nobody can give until you resume. Use it when you're waiting on news, or when you have enough for now. You can resume, end it or hide it later.
Gifts stop and the page stays up as a record of what you raised and who helped. Use it when the need is covered or the situation has changed. If the need comes back, you can reopen it.
Unpublishing takes the page down for everyone but you. Choose this only if the page shouldn't be seen at all, for example if you posted it by mistake.