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 the most common type of headache. It can cause mild, moderate, or intense pain in your head, neck, and behind your eyes. Some people say that a tension headache feels like a tight band around their forehead. Most people who experience tension headaches have episodic headaches. These occur one or two times per month on average. However, tension headaches can also be chronic.