Headaches happen primarily due to overactivity or problems with pain-sensitive structures in the head, such as nerves, blood vessels, or muscles around the skull and neck. They can be categorized mainly as primary headaches (not caused by another disease) or secondary headaches (caused by an underlying condition). Primary headaches include migraines, tension headaches, and cluster headaches, often triggered by factors like stress, poor sleep, dehydration, certain foods, or muscle strain. Secondary headaches arise from other health problems such as infections, injuries, or vascular issues. The pain occurs because nerve endings sensitive to pain send signals to the brain in response to these triggers or conditions.
