There are two types of tension headache: episodic and chronic. Generally, episodic headaches occur randomly and are often the result of temporary stress, anxiety, fatigue or anger. However they may also be rebound headaches, which are medication-induced and both aggravate and mask other headaches. Chronic tension-type headaches may be the result of chronic stress or fatigue, but they can usually be attributed to physical problems, psychological issues or depression. Chronic tension-type headaches are characterised by nearly daily headache and are difficult to manage in primary practice.