Can a brain aneurysm start leaking blood slowly or is it immediate?

A brain aneurysm typically leaks blood suddenly rather than slowly. When an aneurysm leaks, it can cause a subarachnoid hemorrhage, leading to immediate and severe symptoms like a sudden headache, nausea, or loss of consciousness. However, in rare cases, a slow leak may occur, which can lead to subtle or gradual symptoms over time. It's essential to seek medical attention if any concerning symptoms arise.