Hearing allows us to communicate and maintain our spatial awareness of our surroundings. Various factors can interfere with how sound travels through the ear and how the brain interprets those sound signals. When this happens, hearing loss can occur.
The three main types of hearing loss are conductive, sensorineural, and mixed. Each one has different causes and characteristics. This blog will explore the common causes and symptoms of each, as well as recommended treatment courses.
Conductive Hearing Loss
Conductive hearing loss occurs when sound cannot pass through the outer ear or middle ear. The sound either becomes blocked or the signal becomes weakened. For those who have this type of hearing loss, sounds can often seem muffled or quieter than normal.
Common Causes
There are several typical causes for conductive hearing loss. Those may include:
- Ear infections: These can cause fluid to build up in the middle ear.
- Earwax blockage: When earwax builds up enough, it can block the ear canal, making it difficult for sound to pass to the eardrum.
- Damage to the eardrum: This can be a result of an ear infection or from sticking something sharp into the ear canal.
- Problems with the tiny bones of the middle ear: The small bones transmit sound waves to the brain for interpretation. When they are damaged or not working properly, it can make hearing difficult, if not impossible.
- Foreign objects in the ear: This can frequently occur with children.
Symptoms
People with conductive hearing loss may notice pressure inside the ear and have difficulty discerning faint sounds. In some cases, hearing may be better in one ear than the other. Turning up the volume typically improves their hearing to a certain degree.
Treatment Options
The positive news is that conductive hearing loss is often treatable. Often, removing earwax buildup or using antibiotics to clear up ear infections can improve hearing. In rare cases, surgery is sometimes necessary to repair damage to the eardrum or small bones in the middle ear.
Sensorineural Hearing Loss
The second type of hearing loss impacts the auditory nerve and the inner ear, which connects the ear to the brain. While conductive hearing loss blocks sound, sensorineural hearing loss involves how sound is processed.
Common Causes
This type of hearing loss is usually permanent and may be caused by:
- Aging: Over time, the number of functioning hair cells in the inner ear decreases.
- Noise exposure: Continued exposure to loud music, machinery, or explosions can damage hair cells.
- Genetic factors: These can cause hearing issues from birth
- Certain illnesses: These include viral infections
- Ototoxic medications: This type of medication can actually harm the inner ear
- Head injuries: Significant head injuries can damage the auditory nerve
Symptoms
Those individuals with sensorineural hearing loss often experience difficulty understanding speech, particularly in noisy settings. Many times, sounds become distorted and they have a difficult time hearing high-pitched sounds.
Treatment Options
While sensorineural hearing loss is typically permanent, there are effective ways to improve hearing:
- Hearing aids, which amplify sound and make speech easier to understand
- Cochlear implants, for individuals with severe or profound hearing loss
- Assistive listening devices, such as specialized telephones or classroom microphones
These tools help many people maintain clear communication and a high quality of life.
Mixed Hearing Loss
If someone experiences symptoms of both kinds of hearing loss, they are said to experience mixed hearing loss. This means there is damage to multiple parts of the ear, including the outer, middle, and inner ear, as well as the auditory nerve.
Common Causes
This typically occurs when someone with sensorineural hearing loss develops an ear infection or when an accident or disease impacts multiple parts of the ear at the same time. This might also occur when a chronic conductive issue worsens over time and starts to affect the inner ear.
Characteristics and Symptoms
Because mixed hearing loss involves two types of problems, symptoms may vary. Some people notice both muffled sound (conductive) and difficulty understanding speech (sensorineural).
Treatment Options
In most cases, recommended treatment consists of either medical intervention or surgical procedures. Hearing aids and cochlear implants can help with sensorineural issues, though it’s important that a hearing health professional create an appropriate treatment plan first.
Conclusion
Understanding the differences between conductive, sensorineural, and mixed hearing loss helps individuals spot early signs and seek appropriate treatment. This is important because effective treatment starts early. With early intervention, those dealing with hearing challenges can hear better and engage with their friends and loved ones more easily.