In biology, poisons are substances that cause disturbances in organisms, usually by chemical reaction or other activity on the molecular scale, when an organism absorbs a sufficient quantity. The fields of medicine (particularly veterinary) and zoology often distinguish a poison from a toxin, and from a venom. Toxins are poisons produced by organisms in nature, and venoms are toxins injected by a bite or sting (this is exclusive to animals).
A problem with your jaw. Earache is occasionally caused by a problem with the joint of your jaw bone (where the jaw meets the skull). This is known as temporomandibular joint pain and can be caused by problems such as arthritis or teeth grinding.
Whiplash. Whiplash can cause pain behind the ear and down the neck. According to the National Institute of Neurological Disorders and Stroke, whiplash is a collection of symptoms that occur following a rapid flexion and extension injury of the neck.The most common cause of whiplash is a rear-end motor vehicle accident.hoto Credit Jupiterimages/Photos.com/Getty Images. Numerous conditions can cause pain behind the ear and down the neck. According to MedlinePlus, a publication of the National Institutes of Health, neck pain can travel to other parts of the body, such as the shoulder, arm and head.