Headaches can be defined as Primary or Secondary. It is important to differentiate between the two for treatment to be effective.
Primary headaches are recurrent and not caused by any underlying disease or structural problems. Migraine is one type of primary headache, and although painful and at times debilitating, migraines are not dangerous.
Secondary headaches are caused by underlying disease such as infection, injury to the head, brain bleed or tumors. These headaches can be harmless or dangerous, certain “red flags” or warnings signs will indicate this.