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.
Other causes of pain related to the ear include: 1  Injury. 2  Inflammation and infection in the ear canal (the channel between the eardrum and the outside part of the ear). 3  Infection of the external ear and ear lobe (cellulitis)  Neuralgia, pain caused by irritation of the nerves in the ear.