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.
Sometimes when a problem in your neck stimulates a nerve that leads to your scalp, it can cause a headache. Neck Pain and Headache: Likely Causes. Headaches that occur along with neck pain are often caused by: 1  Stress. 2  Tension headaches are often a result of stress, which can cause you to tense the muscles in your neck. 3  A tension headache, also called a muscle-contraction headache, results from stiff, contracted muscles in and around the head.