The majority of headaches are primary headaches; that is, it is not due to another underlying disease. In these cases, diagnosis is made by history and examination, imaging is often not required.
However, some findings require further examination: sudden onset and very severe pain, accompanied by fever or neck stiffness, significant change in the nature of the pain, emergence of neurological findings, new-onset headache over the age of fifty, and new pains seen in immunocompromised people.
If these findings are present, imaging and, if necessary, additional examinations are planned. If there are no findings, early imaging does not change the diagnosis. In this case, determining the type of pain and planning the appropriate treatment is a priority.