You will want to closely examine the spikes or hangars that hold the gutters to your roof as those can become loose and may need to be resecured or.
Check your gutters.
Check your downspout drains.
Check all the spikes that are supposed to go through the gutter through the fascia board and into the rafter behind it.
Check the guttering has a slight run fall or slope towards the outlet.
If you find holes in any gutters caulk can be temporary fix until your gutters can be replaced schedule this soon.
Check for holes or missing pieces.
Technically a perfectly level guttering system will work as the lowest point is the outlet.
Birds find gutters to be a convenient place to make a nest.
You spot birds or pests by your roof.
If you are noticing animals or pests scurrying around your gutters this can be a big sign your gutters are clogged.
At most homes these spikes miss the rafters entirely usually because the spike has just worked its way out of the hole over the years.
Check the space between the gutter and the wall especially if you have noticed water running down the side of the wall during storms or if there are any visible stains on the side of your house.
But in practice you ll find a slight fall is better because it can cope with a larger water flow.
A leaking gutter is as harmful as a missing gutter.
Ideally the roofs properly supported membrane system should run into the gutter.
You ll also want to check the rivets that are near the down spouts.
Finally walk around your home and check all of your downspout drains to ensure nothing is lodged in them.
The best way to avoid these problems is to check your gutters frequently.