All of the above headaches are considered primary headaches. Secondary headaches are brought on by other medical conditions, such as an infection, neurological problem or tumor. For example, a person can get migraines and tension headaches. Pain can be on one side of the head. The sufferer may have an aura, sometimes before the pain begins.
Headaches can vary from mild to severe.
Usually steady and on both sides of head. Can be chronic or periodic. Can vary from moderate to severe. Distracting, but not usually debilitating. Pain can center around one eye.