Do I need to worry about these cracks in the corner of my ceiling. All appear to be hairline. Pencil included in second picture for scale.
Thanks in advance
You only need to worry about cracks when you can fit your hand through them. For hairline cracks like that a bit of filler and paint is fine. The cracks might reappear in the future as they will be caused by movement but it's such a tiny amount of movement there is no need to try to fix anything.