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.
A tension headache is head pain that results from muscle tightening (contraction) in the neck and head.The muscle contraction leads to a slight decrease in blood flow to the surrounding areas and an irritation of pain fibers in the skin, muscles, and blood vessel walls.eadaches may also result from muscle strain associated with injury to the neck muscles. An abnormality in the bones at the back of the neck (cervical vertebrae) or in the area where the mouth opens and closes (temporomandibular joint) may also put tension on the surrounding muscles and lead to a tension headache.