This is a good question. It is very important that you seek care as soon as possible to determine what is causing your headaches. Make an appointment with your primary care doctor
or go to an urgent care or emergency room if the pain is severe and you cannot get relief. A doctor will do a full history and physical and depending on what is discovered during your exam, may order imaging such as a CT or MRI
of your head. It is important to know if you have any history of prior headaches. A common cause of headaches is tension headaches which usually are described as feeling as though you have a tight band squeezing around your head. These are often caused by stress, caffeine withdrawal, and lack of sleep. Migraines are another cause of headaches. These are usually worse on one side of the head and are characterized by photophobia (light makes the pain worse), pounding pain, and nausea. Although most causes of headache
are benign, rarely a constant headache can be a sign of something very serious such as a brain tumor or aneurysm so again, it is very important that you seek care as soon as possible.