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.
Often people with migraine will want to try and compress the pain in temple, whereas in tension headache the tendency is to massage! Cervicogenic headache will cause a pain on one side of the head. Often the area of maximal pain is not where you expect for a pain that is due to a problem in a neck joint. It can be above the eye, or work its way down to the ear or behind the ear.