Production of cerumen (earwax) is a normal and naturally occurring process. Cerumen moisturizes the skin of the external auditory canal and protects it from infection, providing a barrier against the intrusion of water, foreign bodies, and even insects and other arthropods. However, this self-cleaning mechanism fails in certain individuals, and cerumen can become impacted. Excessive buildup of cerumen is likely underdiagnosed and undertreated. It is most often diagnosed by direct visualization by a trained clinician using an otoscope but may require more complex equipment, such as an operating microscope, for removal.
Cerumen, commonly known as earwax, is a naturally occurring substance produced in the external auditory canal of humans and many other mammals. It serves a vital role in maintaining ear health by moisturizing the skin of the ear canal and providing protection against infection. Cerumen acts as a barrier, preventing the entry of water, foreign bodies, and even insects.
Typically, cerumen is expelled from the ear canal spontaneously due to normal jaw movement. However, this self-clearing mechanism can fail in some individuals, leading to cerumen impaction. This occurs when earwax accumulates and becomes lodged in the ear canal, potentially causing a range of symptoms and complications.
Cerumen impaction is a common ear complaint, affecting a significant portion of the population. It is estimated to occur in up to 6% of the general population, with higher prevalence rates among children (10%) and the elderly or cognitively impaired (greater than 30%). Individuals who routinely wear hearing aids or earplugs, as well as those with exostoses or anatomical abnormalities of the external ear canal, are also at increased risk.
The excessive buildup of cerumen is often underdiagnosed and undertreated. In the United States alone, it results in millions of patient visits and cerumen removal procedures each year. Cerumen impaction can interfere with various audiological assessments, including tympanic membrane examination, audiometry, and hearing aid fitting.
Diagnosis of cerumen impaction is typically made through direct visualization of the ear canal by a trained clinician using an otoscope. In some cases, more complex equipment, such as an operating microscope, may be required for removal.
Cerumen is composed primarily of keratin, which accounts for approximately 60% of its mass. Keratin is derived from shed skin cells within the external auditory canal. The remaining 40% of cerumen consists of lipids and peptides secreted by the sebaceous and ceruminous glands, located in the lateral third of the ear canal.
The acellular component of cerumen comprises long-chain saturated and unsaturated fatty acids, alcohols, squalene, and cholesterol. The composition of cerumen can vary, with harder cerumen containing a higher proportion of keratin compared to softer cerumen.
Impacted cerumen may also contain neutrophils and is more likely to be colonized by bacteria or fungi. Studies have shown that fungal growth, particularly Aspergillus terreus, is commonly found in cerumen samples from patients with recurrent impactions. When bacteria are present, Staphylococcus aureus is the most frequently identified species.
Cerumen production rates can be influenced by external factors. Frequent insertion of foreign objects into the ear canal, such as cotton swabs, hearing aids, or earbuds, can accelerate cerumen production and potentially alter its composition. Similarly, using cotton swabs to address pruritus (itching) in the ear canal can paradoxically increase cerumen production and exacerbate the itching.
While excessive cerumen accumulation is often asymptomatic, treatment is recommended when patients present with symptoms such as hearing loss, ear fullness, pruritus, dizziness, tinnitus, or otalgia (ear pain). Cerumen removal is also indicated when impaction prevents adequate examination of the ear by otoscopy, especially in cases with other concerning symptoms like hearing loss, tinnitus, pain, or vertigo.
Another common reason for cerumen removal is to facilitate audiometric examination, including immittance tympanometry. This test requires an unobstructed ear canal to accurately measure air pressure and assess the compliance of the tympanic membrane. Cerumen impactions can also hinder routine surveillance of otologic conditions, such as cholesteatoma. Patients with chronic otologic conditions, like open mastoid bowls after surgery, may require regular cerumen removal for proper monitoring, ideally performed by the original surgeon.
In asymptomatic patients, cerumen removal is not always necessary. It is important to educate patients about the beneficial properties of cerumen, including its bacteriocidal, protective, and emollient effects. Unless symptoms are present, patients should be encouraged to leave their cerumen undisturbed. Observation can be offered as a suitable management strategy in such cases.
However, treatment should be considered in specific populations, such as young children, the elderly, individuals with schizophrenia, or those with cognitive impairments. These patients may have difficulty verbalizing, perceiving, or attending to concerning symptoms, which can significantly impact their quality of life.
While there are no absolute contraindications to cerumen removal, clinicians should exercise caution in certain patient populations. These include individuals with immunosuppressive illnesses (e.g., HIV, diabetes mellitus, transplant recipients), those on chronic anticoagulation therapy, and patients with anatomical anomalies that narrow the ear canal. These patients may be at higher risk of complications from manual removal.
In patients with diabetes mellitus, the cerumen typically has a higher pH, increasing the risk of superimposed bacterial infections. Immunosuppressed patients are more susceptible to infection even after minor trauma, necessitating meticulous and atraumatic techniques during cerumen removal. This population is also at higher risk for malignant otitis externa, which can mimic cerumen impaction or aural polyps, particularly to inexperienced examiners.
Caution is advised in chronically anticoagulated patients due to the increased risk of hemorrhage or hematomas. Irrigation should only be used for cerumen removal if the tympanic membrane can be visualized beforehand to rule out perforation.
Cerumenolytics are generally safe, but their use is contraindicated in patients with a perforated tympanic membrane or a history of ear surgery, including tympanostomy tube placement. Common side effects of cerumenolytics include local irritation and rash. Prolonged use may also lead to superinfection.
For simple cerumen removal in a cooperative patient without anatomical abnormalities, a cerumen curette and an otoscope are typically sufficient. Gentle irrigation with saline in a syringe can also be a useful adjunct.
Particularly soft or hard cerumen may require additional instrumentation, such as a fine suction tip (5 Fr Frazier tip or similar), right-angle hook, or alligator forceps. When advanced instrumentation is necessary, an operating microscope and an otologic speculum can facilitate the procedure. In such cases, cerumen removal is typically performed by an otolaryngologist or an otolaryngology technician.
Simple cerumen removal can be performed by various healthcare professionals, including emergency physicians, primary care providers, nurses, or technicians. However, when anatomical abnormalities (congenital, post-traumatic, post-operative, or neoplastic) complicate the removal process, the expertise of an otolaryngologist or otolaryngology technician may be required.
In some cases, particularly with children or cognitively impaired individuals, general anesthesia may be necessary to prevent movement during the procedure and minimize the risk of damage to the external auditory canal and middle ear structures. Smaller children may be restrained using a papoose, although this often requires assistance from a parent or another clinician to ensure the patient remains still.
Before cerumen removal, it is crucial to counsel the patient about the procedure. This helps to secure their cooperation, limit movement, and minimize the risk of injury to the external auditory canal, tympanic membrane, and middle ear structures. Patients should be informed about the potential risks of pain, bleeding, and damage to these structures, which could lead to hearing loss.
The sensitivity of the external auditory canal skin increases closer to the tympanic membrane, which is highly sensitive to pain even with minimal contact. Due to the presence of terminal branches of Arnold's nerve (a branch of the vagus nerve) supplying sensation to parts of the external auditory canal, some patients may cough or even gag during the procedure. The clinician should be prepared to swiftly remove the instruments from the ear canal if this occurs, and patients should be made aware of this possibility beforehand.
When treatment is deemed appropriate, there are three primary methods for cerumen removal: cerumenolytic agents, irrigation, and manual removal.
Cerumenolytic agents are liquid solutions designed to thin, soften, break up, or dissolve earwax. These agents are typically water- or oil-based compounds, with water-based solutions being the most commonly used. Common ingredients in water-based cerumenolytics include hydrogen peroxide, acetic acid, docusate sodium, and sodium bicarbonate. Docusate sodium appears to be particularly effective, especially when used as a pretreatment before irrigation. Common ingredients in oil-based cerumenolytics include peanut, olive, and almond oils.
Most cerumenolytic drops are available over the counter. The typical dosage involves instilling up to five drops into the affected ear, one to two times daily for three to seven days. Carbamide peroxide is a commonly prescribed cerumenolytic, administered as five to ten drops twice daily for up to four days. These drops work by releasing oxygen, which softens the cerumen and promotes spontaneous extrusion. They also possess a weak antibacterial effect.
Irrigation is another safe and effective method for removing unwanted cerumen, provided the tympanic membrane can be visualized beforehand. Several irrigation methods can be employed in the clinical setting. A common approach involves using a syringe to introduce warm water alone or a 50/50 mixture of water and hydrogen peroxide into the ear canal, with a basin positioned underneath to collect the drainage.
It is crucial to use water that is close to the patient's body temperature, as excessively warm or cool fluid can induce a convection current in the semicircular canals, leading to vertigo. This is particularly relevant in patients with pressure equalization tubes or a tympanic membrane perforation. This phenomenon underlies the mechanism of caloric testing of the vestibular system.
An alternative to using a syringe is a standard oral jet irrigator, with or without a modified tip. While these methods are inexpensive and generally safe, they can pose a risk of trauma, including tympanic membrane perforation. Electronic irrigators are also available, but there are limited controlled trials comparing the efficacy of different irrigation methods. Ear irrigation appears to be less effective than manual removal under visualization in patients over the age of 70 years.
Manual removal is the third method recommended by the American Academy of Otolaryngology-Head and Neck Surgery for removing unwanted cerumen. This technique often requires specialized instrumentation for enhanced visualization, such as a binocular microscope and a handheld speculum. Cerumen removal may involve the use of a metal or plastic loop, spoon, curette, or alligator forceps. Some instruments feature illuminated tips to improve visualization during the procedure.
The primary advantage of manual removal is a reduced risk of infection, as the ear canal is not exposed to moisture. However, it carries a small risk of perforation and local trauma, particularly if the patient is uncooperative or the clinician lacks experience. This method demands greater clinical skill and patient cooperation, especially in the presence of anatomical anomalies such as exostoses or a mastoid bowl.
To prevent further cerumen accumulation in patients with recurrent impactions (more than once per year), weekly application of mineral oil to the external canal for 10 to 20 minutes may be beneficial. Patients who wear hearing aids should remove them for eight hours daily to reduce cerumen buildup.
Several over-the-counter devices marketed for cerumen removal should be avoided. Cotton swabs, while commonly used, can worsen impaction by pushing the wax deeper into the ear canal or causing tympanic membrane perforation. Ear candling, which involves inserting a hollow tube coated in beeswax into the ear canal and igniting the other end, is another popular home remedy that should be avoided. Despite claims of a "chimney effect" purportedly drawing out earwax, scientific studies have demonstrated its ineffectiveness and potential for injury. The United States Food and Drug Administration strongly advises against using ear candling devices.
When treating patients for cerumen impaction, it is crucial to ensure that symptoms of other underlying conditions are not falsely attributed to the earwax. The presenting symptoms of cerumen impaction, such as otalgia, tinnitus, dizziness, hearing loss, aural fullness, ear itching, and foreign-body sensation, are nonspecific and can be associated with various other conditions.
Once the cerumen impaction has been removed, it is essential to rule out comorbid conditions if symptoms persist. These may include Eustachian tube dysfunction, otitis media, otosclerosis, sensorineural hearing loss, temporomandibular joint syndrome, and upper respiratory tract infections. Further examination and testing may be necessary to establish an accurate diagnosis.
Successful treatment of cerumen impaction relies on a coherent and cooperative patient. If the patient is unwilling or unable to participate, removal of impacted cerumen and otologic examination may require general anesthesia or conscious sedation. Anesthesia is typically reserved for very young patients or those with neurocognitive or neurobehavioral conditions that prevent safe treatment while fully awake.
The management of cerumen impaction requires a collaborative interprofessional team, including family clinicians, otolaryngologists, and nursing staff, depending on the complexity of the case. Effective communication and accurate documentation among all team members are essential for optimal patient outcomes and minimizing adverse events.
Several home treatments can be used to soften and remove impacted earwax. However, it is crucial to consult a healthcare provider before attempting any treatment, especially if there is a possibility of a perforation in the eardrum.
Cerumenolytic solutions can be used to dissolve earwax in the ear canal. These solutions include:
To use these solutions, a few drops are placed into the affected ear while lying on the opposite side, allowing the solution to drip into the ear canal. Over-the-counter earwax removal products should be used according to the directions provided.
Ear irrigation involves rinsing the ear canal with water or saline solution using a syringe. It is generally recommended to soften the wax first with a cerumenolytic solution before irrigating the ear. A bulb syringe is used to gently irrigate the ear canal. Caution is advised when irrigating ears with diabetes, a perforated eardrum, a tube in the eardrum, skin problems such as eczema in the ear canal, or a weakened immune system.
If home treatments are ineffective or if the earwax has accumulated to the point of blocking the ear canal and impairing hearing, an ENT specialist should be consulted. The specialist may prescribe eardrops to soften the wax or remove it through washing or vacuuming. In some cases, microscopic visualization may be necessary for wax removal.
Using cotton swabs to remove earwax is generally discouraged. Most attempts to clean the ear with cotton swabs merely push the wax deeper into the ear canal, causing a blockage. Additionally, accidental trauma to the eardrum or ear bones can occur if the swab is inserted too deeply.
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