Most headaches are not serious. Tension headaches are the most common type of headache. Normally, tension headaches are not severe enough to prevent you doing everyday activities. They usually last for 30 minutes to several hours, but can last for several days. In many cases, you can treat your headache at home. Find out more about your headache symptoms, when you can use self-care, and what to do if your condition worsens and you need medical help.