If no correlation exists between the variables, the points appear randomly scattered on the coordinate plane. If a large correlation exists, the points concentrate near a straight line. Scatter plots are useful data visualization tools for illustrating a trend. If the vertical (or y-axis) variable increases as the horizontal (or x-axis) variable increases, the correlation is positive.
Whiplash Whiplash, a severe neck injury, can cause stiffness and pain in the neck, headache, dizziness, and more. Aortic stenosis Aortic stenosis is a condition of the heart causing shortness of breath, dizziness, or chest pain.
At some point after this painful event has started, your headache occurs and that is the reason it feels like the neck pain caused the headache. The pain in your neck happens because you get migraines and not the other way around. However, because the neck pain precedes the actual migraine headache pain (two separate types of pain) it feels like the neck pain has caused the migraine.