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PRIMARY HEADACHES
A primary headache has a key cause and is not a symptom of an underlying condition. Common examples are tension headaches, migraines and cluster headaches Tension headache The most common primary headache, which is felt as a dull, scattered and mild-to-moderate pain A tight sensation often occurs around the head, which may extend to or from the neck, lasting a few hours or several days In some cases, it can be triggered by stress It is usually diagnosed through the reported medical history, and sometimes entails a physical examination Treatment includes over the counter and/or prescription pain medication or muscle relaxants In some instances, stress management can be useful Migraine The second most common cause of a primary headache, which usually involves a pulsating or throbbing pain It can affect one side of the head, or both In some cases, it is associated with nausea and/or vomiting and blurred vision Genetic and environmental factors may contribute It is usually diagnosed by means of clinical signs and symptoms Hormonal changes, bright lights and stress can be triggers Treatment includes over the counter and/or prescription pain medication – such as non-steroidal anti-inflammatory medication. Sometimes, anti-nausea medication may be indicated Cluster headache This comes on suddenly and occurs in clusters in weekly or monthly episodes, with pain-free periods in between Severe pain is usually experienced around the eye, causing swelling and possibly drooping of the eyelid It is mostly diagnosed through clinical signs and symptoms Due to its speedy onset, it is usually treated with fast acting pain medication, specific injectables, and sometimes even with high-flow oxygen inhalation Alcohol should be avoided during a cluster period as it can make the attack worse
This describes a headache that is caused by an underlying condition, such as the following: 
