If the headache is in a <5 year old refer to paeds.
— Manual Of Medicine (@ManualOMedicine) July 6, 2018
Brain Tumour
Headache for more than 2 weeks with any other symptoms should get imaged - preferably with an MRI, but if not available a contrast CT.
Meningitis
Similar to in adults.
Bacterial meningitis is an infection of the surface of the brain (meninges) by bacteria that have usually travelled there from mucosal surfaces via the bloodstream.
Meningococcal disease occurs as a result of a systemic bacterial infection by Neisseria meningitidis (meningococcus).
https://adultemergencymedicine.blogspot.com/search/label/meningitis
https://www.headsmart.org.uk/symptoms/signs-and-symptoms/children/persistent-recurrent-headache-children/
https://assets.headsmart.org.uk/live/media/filer_public/c7/06/c706d496-44d4-461a-9319-0a5c3596d360/quickreferenceguide_spread_final.pdf
https://www.rcemlearning.co.uk/foamed/pem-headaches/
https://www.rcemlearning.co.uk/modules/meningococcal-disease-and-meningococcal-meningitis/