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.
Tension Headache. Pain in the back of the head may affect the muscles when neck and head tighten. The possible cause of the headache is stress. The fluctuating levels of neurotransmitters can contribute to the headache.Often, the pain begins at the back of the head.his kind of back of head pain, characterized as secondary headaches, are caused by neck problems. It can be felt when the spinal joints located in neck are irritated, or when the muscles of the neck are strained. Bad posture, cervical abnormalities and stress could be contributing factors.