by 
The Curious Bag
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An earache can be an uncomfortable problem with many potential causes. Injury to the ear itself is a possibility. The pain may also be caused by problems outside of the ear, in locations such as the sinuses, teeth or jaw.
Arthritis
In some cases, an earache may be a symptom of arthritis in the jaw, according to Medline Plus, a service of the National Institutes of Health. The pain from the inflamed joints may manifest as an earache.
Sinus Infection
A sinus infection may cause an earache, states Medline Plus. A sinus infection occurs when the the sinus cavity fills with mucus allowing bacteria to grow.
TMJ Misfunction
According to the Merck Manual, TMJ syndrome is often the cause of an earache in adults without other symptoms. This is when the temporomandibular joints connecting the jaw to the skull do not function properly.
Tooth Abscess
A tooth abscess may result in an earache, according to Medline Plus. This occurs when bacteria infects a tooth causing it to rot.
Injury to the Ear
An earache may be caused by damage to the ear itself, including a ruptured eardrum, ear injury from pressure changes, or a middle or outer ear infection.
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