Hearing Problems in Multiple Sclerosis - An Overview

What Are the Causes of Hearing Problems in Multiple Sclerosis?

Causes of hearing issues in multiple sclerosis (MS) are:

• Lesions in the brainstem and auditory pathways: Nerve damage and lesions occurring in areas like the brainstem (the part that connects the brain to the spinal cord), which is associated with auditory processing, can disrupt the transmission of sound signals. Furthermore, the type of hearing loss also depends on the area of the brainstem being damaged. Damage to these areas can cause various auditory dysfunctions, such as difficulty in sound localization, auditory discrimination, and speech comprehension.

• Inflammation and demyelination processes: As the body’s immune system attacks nerve tissues, it may also damage the auditory nerve (also known as the vestibulocochlear nerve) and the structures involved in sound processing. This inflammation results in reduced sensitivity to sound and distorted perception of sound. This is how MS causes vestibular disorder.

• MS-related fatigue and cognitive impairment: Fatigue affects up to 80 percent of MS patients, which can increase auditory issues by reducing the brain's capacity to process auditory information effectively. Additionally, cognitive impairments can also affect hearing.

• Vascular dysfunction: In patients with MS, there is a decrease in blood flow to the brain and impairment in the microvasculature. This will cause a reduced oxygen and nutrient supply to the auditory system, which, over time, can cause significant damage. All this will lead to hearing problems.

• Medication side effects: Some medications commonly used to manage MS symptoms, such as corticosteroids and disease-modifying therapies (DMT), may have ototoxic effects, causing damage to the inner ear and symptoms such as sensorineural hearing loss (SNHL), tinnitus (ringing sound), and vestibular dysfunction (balancing issues leading to vertigo and dizziness) may occur.

What Is Sensorineural Hearing Loss in MS?

Sensorineural hearing loss in MS is a type of hearing loss in which there is damage to the inner ear and the auditory nerve pathways. These often manifest as difficulty in hearing soft voices, muffled louder voices, and tinnitus. Furthermore, the ears feel blocked and sensitive to noise, which can lead to difficulty in hearing. This type of hearing loss is more common among MS individuals, and sometimes, this can represent a form of relapse.

Can Sudden Hearing Loss Occur in MS?

When 30 decibels or more of hearing loss occurs in a short period, it is known as sudden hearing loss. Yes, sudden hearing loss can occur in individuals with MS, although it is rare. Still, in some cases, it may occur as a first noticeable symptom of MS (usually occurring in one ear) and during MS relapse. This is caused by damage to the auditory nerve or the sensory organs of the ear. This can happen in a period of a few hours to three days. This can make everyday conversations feel like whispers. Treatment typically involves the use of corticosteroids to reduce inflammation.

What Is the Relationship Between MS and Tinnitus?

Tinnitus is known as a ringing sensation in the ear. It presents as a sudden ringing in one ear. MS and tinnitus are a very rare combination. This condition occurs when auditory nerve damage occurs due to MS. In rare cases, tinnitus is the first sign of MS-related hearing loss. The patient may suddenly notice their tinnitus worsening.

How to Diagnose Hearing Problems in Multiple Sclerosis?

Diagnosis includes:

• Thorough evaluation: A thorough assessment should be conducted by healthcare professionals skilled in both neurology and audiology. This can help understand the nature and severity of auditory defects.

• Audiological assessment: Audiological assessments include

  • Pure-tone audiometry: This helps in measuring how well the patient can hear across different frequencies (pitch) and intensities (loudness).

  • Speech audiometry: Speech audiometry contains two tests. The first test assesses the volume required to hear the speech. The second test assesses your ability to understand and recognize spoken words.

  • Auditory brainstem response (ABR) testing: This measures how well the brain and inner ear respond to sound.

  • Otoacoustic emissions (OAEs): OAEs are sounds generated by the inner ear in response to sound. They help evaluate cochlear function.

• Imaging studies: Magnetic resonance imaging (MRI) can help identify lesions in the brainstem. The location and extent of these lesions can help in assessing the severity of auditory defects.

How Can I Manage MS Hearing Problems?

The management of hearing issues in MS includes:

• Always consult an audiologist for a thorough evaluation, including the extent of hearing loss.

• Consider options like hearing aids, which can be worn in or behind the ear. These hearing aids can amplify sounds.

• Other options, such as assistive listening devices (ALDs), can help improve the perception of sounds.

• Furthermore, informing friends and family about their hearing difficulties, asking them to speak loudly, and selecting quiet environments when conversing can also enhance hearing.

• In cases of tinnitus, medicines such as tricyclic antidepressants are prescribed.

• In cases of sudden hearing loss, corticosteroids are prescribed to reduce inflammation.

What Are the Home Treatments for MS Hearing Loss?

Home treatment for MS hearing loss includes:

• Avoid triggers such as hot environments and exercise. Loud noises can also trigger hearing loss.

• Maintaining a healthy diet, including iron-rich foods, green leaves, beans, and foods rich in omega-3 fatty acids, can reduce tinnitus and other hearing issues.

• Consider taking supplements like vitamin C, carotenoids, and vitamin D.

• Good ear hygiene also includes cleaning ears regularly (do not use cotton swabs) and using ear drops.

• Massage therapies and ginger oil can improve nerve health by increasing blood flow. However, always consult the doctor before using any of these options.

How Long Can MS Hearing Problems Last?

Hearing problems in MS are usually short-lived (weeks to months). When addressed promptly, it resolves quickly. However, sometimes individuals may experience symptoms for a longer period, and a few people may struggle with hearing loss permanently. The severity of the situation usually depends on the extent of brain damage.

Conclusion:

Hearing problems do not happen often in people with MS, but they can happen to a few. Some may experience hearing trouble for a short time, while others may have it permanently. These hearing losses can be managed by the healthcare team with the help of proper diagnosis and tailored treatment plans.

Key Takeaways:

• Hearing loss among individuals with MS occurs due to damage to the brainstem, which is responsible for processing sound signals. But studies have shown that as the inflammation subsides, the hearing problems may improve.

• Other symptoms, such as vertigo and facial numbness, may accompany it.

If you or your loved ones face any hearing issues due to MS, consult our otolaryngologist online.