Earache may occur in isolation or along with discharge or, rarely, hearing loss.
Pathophysiology of Earache
Ear pain may come from a process within the ear itself or may be referred to the ear from a nearby nonotologic disorder.
Pain from the ear itself may result from a pressure gradient between the middle ear and outside air, from local inflammation, or both. A middle ear pressure gradient usually involves eustachian tube obstruction, which inhibits equilibration between middle ear pressure and atmospheric pressure and also allows fluid to accumulate in the middle ear. Otitis media causes painful inflammation of the tympanic membrane as well as pain from increased middle ear pressure (causing bulging of the tympanic membrane).
Referred pain can result from disorders in areas innervated by cranial nerves responsible for sensation in the external and middle ear (5th, 9th, and 10th). Specific areas include the nose, paranasal sinuses, nasopharynx, teeth, gingiva, temporomandibular joint (TMJ), mandible, parotid glands, tongue, palatine tonsils, pharynx, larynx, trachea, and esophagus. Disorders in these areas sometimes also obstruct the eustachian tube, causing pain from a middle ear pressure gradient.
Etiology of Earache
Earache results from otologic causes (involving the middle ear or external ear) or from nonotologic causes referred to the ear from nearby disease processes (see table Some Causes of Earache).
With acute pain, the most common causes are
With chronic pain (> 2 to 3 weeks), the most common causes are
Chronic eustachian tube dysfunction
Also with chronic pain, a tumor must be considered, particularly in older patients and if the pain is associated with ear drainage. People with diabetes or chronic kidney disease or in other immunocompromised states may develop a particularly severe form of external otitis termed malignant or necrotizing external otitis. In this situation, if abnormal soft tissue is found on examination of the ear canal, the tissue must be biopsied to rule out cancer.
TMJ dysfunction is a common cause of earache in patients with a normal ear examination.
Evaluation of Earache
History
History of present illness should assess the location, duration, and severity of ear pain and whether it is constant or intermittent. If intermittent, it is important to determine whether it is random or occurs mainly with swallowing or jaw movement. Important associated symptoms include ear drainage, hearing loss, and sore throat. The patient should be asked about any attempts at cleaning the ear canal (eg, with cotton swab) or other recent instrumentation, foreign bodies, recent air travel or scuba diving, and swimming or other recurrent water exposure to ears.
Review of systems should ask about symptoms of chronic illness, such as weight loss and fevers.
Past medical history should ask about known diabetes or other immunocompromised state, previous ear disorders (particularly infections), and amount and duration of tobacco and alcohol use.
Physical examination
Patients should be checked for fever.
Examination focuses on the ears, nose, and throat.
The pinna and area over the mastoid process should be inspected for redness and swelling. The pinna is gently tugged; significant pain exacerbation with tugging suggests otitis externa. The ear canal should be examined for redness, discharge, swelling, cerumen or foreign body, and any other lesions. The tympanic membrane should be examined for redness, perforation, and signs of middle ear fluid collection (eg, bulging, distortion). A brief bedside test of hearing should be conducted, including the Weber and Rinne tests using a 512-Hz tuning fork.
The throat should be examined for erythema, tonsillar exudate, peritonsillar swelling, and any mucosal lesions suggesting cancer.
TMJ function should be assessed by palpation of the joints on opening and closing of the mouth, and notation should be made of trismus or evidence of bruxism such as wearing down of teeth.
The neck should be palpated for lymphadenopathy. In-office fiberoptic examination of the pharynx and larynx should be considered, particularly if no cause for the pain is identified on routine examination and if nonotologic symptoms such as hoarseness, difficulty swallowing, or nasal obstruction are reported.
Red flags
The following findings are of particular concern:
Diabetes or immunocompromised state or chronic kidney disease
Redness and fluctuance over mastoid and protrusion of auricle
Severe swelling at external auditory canal meatus
Chronic pain, especially if associated with other head/neck symptoms
Interpretation of findings
An important differentiator is whether the ear examination is normal; middle and external ear disorders cause abnormal physical findings, which, when combined with history, usually suggest an etiology (see table Some Causes of Earache). For example, patients with chronic eustachian tube dysfunction have abnormalities of the tympanic membrane, typically a retraction pocket.
Patients with a normal ear examination may have a visible oropharyngeal cause, such as tonsillitis or peritonsillar abscess. Ear pain due to neuralgia has a classic manifestation as brief (usually seconds, always < 2 minutes) episodes of extremely severe, sharp pain. Chronic ear pain without abnormality on ear examination might be due to a TMJ disorder, but patients should have a thorough head and neck examination (including fiberoptic examination) to rule out cancer.
Testing
Most cases are clear after history and physical examination. Depending on clinical findings, nonotologic causes may require testing (see table Some Causes of Earache). Patients with a normal ear examination, particularly with chronic or recurrent pain, may warrant evaluation with an MRI of the base of skull to rule out cancer.
Treatment of Earache
Underlying disorders in patients with ear pain are treated.
Patients should be instructed to avoid digging in their ears with any objects (no matter how soft the objects are or how careful patients claim to be). Patients with otitis externa should keep their ears dry. Also, patients should not irrigate their ears unless instructed by a physician to do so, and then only gently. An oral irrigator should never be used to irrigate the ear.
Key Points
Most cases are due to infection of the middle or external ear.
History and physical examination are usually adequate for diagnosis.
Nonotologic causes should be considered when ear examination is normal.
