“Headache” is an extremely common symptom. The vast majority of cases get better on their own; others have special treatments that can be helpful, and on rare occasions people die.
We define Headaches by their time frame. Don’t forget that a person with either “chronic” or “recurrent” headaches can get a different kind of “acute” one.
Acute — going on less than 3-4 weeks
Chronic — lasting longer than 1 month (sometimes years)