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 Photo Credit Businessman having painful headache isolated image by Laser from Fotolia.com. Pain that occurs in the neck and back of the head is a common set of symptoms. The cervical spine is a complex structure made up of seven cervical vertebrae, ligaments, muscles and sensitive nerves.Since the muscles of the cervical spine attach to the skull, problems in the neck can cause headaches in the back of the head.Most causes of neck pain or head pain are not serious though some may be.Any pain that radiates into the arm or shoulder, pain that does not resolve within a few days or loss of sensation or strength should be brought to the attention of a doctor.ension headache Photo Credit Businessman having painful headache isolated image by Laser from Fotolia.com. Pain that occurs in the neck and back of the head is a common set of symptoms. The cervical spine is a complex structure made up of seven cervical vertebrae, ligaments, muscles and sensitive nerves.