My head hurts?

Depends on details: A doctor can evaluate headaches and start treatment. Some medicines are "preventive," and others stop pain after a headache starts. Headaches are very common, and have many causes. Some are migraines and others are tension headaches. Emergencies include having a "worst headache ever," a headache that gets worse and worse as the day goes on, a headache accompanied by other major symptoms, etc...