Correct monitor height is the screen position where the top edge sits at or just below your eye level, so your gaze lands on the upper-middle of the screen without tilting your head up or down.
Kyphosis is the medical term for an excessive forward curve in the thoracic spine. Dowager's hump and neck hump are two informal names for a related but more specific symptom.
A posture headache is muscle and joint-driven pain from neck strain, while a migraine is a neurological condition involving specific brain and nerve pathway changes, and the two respond to completely different things.
A neck reset is a short, targeted sequence of positional changes and muscle release techniques designed to interrupt the tension pattern behind a posture headache within minutes, instead of over days.
