As with acute headaches, there are many possible causes of subacute headaches, or headaches that occur over a period of weeks to months. These headaches may signify something serious, especially if the pain worsens over the months or if it occurs in the elderly.
Some possible causes of subacute headaches include:
Chronic headaches are headaches that a person has experienced for years. While each attack may be quite disabling, these types of headaches are not usually caused by a serious condition. The most common cause of chronic headaches is tension headaches (also known as tension-type headaches or stress headaches). Some other chronic headache causes include: