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.
It is more common in children because of smaller Eustachian tubes that drain the ears into the back of the throat, but otitis media in adults can also happen for many different reasons. A middle ear infection can be caused by drainage from a cold, sinus infection, or even allergies.