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.
Head and Neck Tension. Tension headaches cause pain and tightness in your neck, head and scalp muscles. Improper neck alignment while sleeping, staying in a certain sleep position for an extended period of time and sleeping in a cold room may all trigger a tension headache, says MedlinePlus. Neck pain may affect any related muscles, nerves and spinal vertebrae, including your jaw, head, shoulders and upper arms.