A headache that is caused by a brain tumor is usually worse in the morning and usually starts to get better throughout the day.
A Brain Tumor headache is often also a dull but persistent headache and the brain tumor headache can sometimes cause pain all over your head or may only happen on just one side of the head.
If you have a constant headache that seems to get worse or doesn't go away within a few days or constantly comes back then it would be best to see a doctor and let them know.
You can then go in for a brain scan and find out if it's a cause of a brain tumor or something less serious.
If you're worried it may be a brain tumor then it would be a good idea to see a doctor just to be safe.