Hearing loss and tinnitus can have various causes, ranging from damage to the inner ear to external factors. Here are the main causes that can lead to these conditions:
1. Age-related changes (presbycusis)
Age-related hearing loss: As people age, their hearing, especially for high-frequency sounds, worsens. This is due to the natural wear and tear of the auditory hair cells in the inner ear.
Tinnitus: Can accompany age-related hearing changes and be the result of damage to the hair cells.
2. Noise exposure
Long-term exposure to loud sounds: Frequently working in noisy environments (factories, concerts, construction sites) or listening to loud music can damage the hair cells in the inner ear.
Single loud sounds: An explosion or gunshot near the ear can cause acute hearing loss and tinnitus.
3. Ear Infections and Diseases
Otitis: Middle ear infections can cause temporary hearing loss and tinnitus due to inflammation and fluid buildup.
Labyrinthitis: Inflammation of the inner ear that can lead to hearing loss and tinnitus.
4. Inner Ear Diseases
Meniere’s Disease: A chronic inner ear disorder that causes dizziness, tinnitus, and progressive hearing loss.
Acoustic Neuroma: A benign tumor of the auditory nerve that can cause progressive hearing loss and tinnitus on one side.
5. Circulatory Problems
Vascular Problems: Poor circulation to the ear can lead to tinnitus and hearing loss.Hypertension: High blood pressure can cause tinnitus because it increases the pressure on the inner ear structures.
6. Medications and Toxics
Ototoxic Drugs: Certain antibiotics, anticancer drugs, diuretics, and nonsteroidal anti-inflammatory drugs can damage the auditory nerve or inner ear structures.
Toxics: Exposure to heavy metals or other toxins can cause hearing loss.
7. Head and Ear Injuries
Traumatic brain injury: Can damage the auditory structures or auditory nerve.
Barotrauma: Sudden changes in pressure (such as during takeoff or diving) can cause damage to the inner ear.
8. Cerumen Impaction
Clogging of the ear canal with wax: This is a reversible cause of hearing loss and may be accompanied by tinnitus.
9. Neurological and other systemic diseases
Multiple sclerosis: Can cause tinnitus and hearing loss due to damage to the nerve pathways.
Diabetes: Damage to small vessels and nerves in diabetes can lead to hearing loss.
Temporomandibular joint problems: Dysfunction of the temporomandibular joint is sometimes accompanied by tinnitus.
10. Stress and psycho-emotional factors
Emotional stress: Can aggravate tinnitus and be one of the factors that increases the perception of tinnitus.
Why do people hear tinnitus?
Hair cells in the cochlea of the inner ear convert sound waves into electrical signals that are transmitted to the brain.When these cells are damaged, such as by exposure to loud noises, age, or disease, they can send false signals to the brain. This causes the brain to interpret them as sound, causing the sensation of tinnitus.
Also, if the auditory nerve or areas of the auditory cortex are damaged, this can lead to changes in the neurons that process sound information. For example, if you have hearing loss, the brain may “amplify” the perception of sound to compensate for the missing information. This leads to hyperactivity in the auditory areas of the brain, which can be perceived as tinnitus.
How can stem cells help with partial hearing loss?
Stem cells have significant potential in the treatment of hearing loss, as they can repair damaged cells and tissue in the inner ear. Hearing loss is often associated with damage to the hair cells, auditory nerve, or other structures of the inner ear, and stem cells can help repair this damage in a variety of ways. Here are some ways stem cells can help with hearing loss:
1. Hair Cell Regeneration
Hair cells in the cochlea of the inner ear play a key role in converting sound waves into electrical signals that are then transmitted to the brain. These cells do not regenerate naturally in humans, and their damage or death leads to hearing loss. Stem cells can be used to:
Differentiate into hair cells: Research shows that certain types of stem cells (such as embryonic or induced pluripotent stem cells) can differentiate into hair cells and replace damaged ones.
Stimulate regeneration: Stem cells can release growth factors and other molecules that stimulate the remaining hair cells to regenerate and promote their repair.
2. Repair the auditory nerve
Hearing loss can also be caused by damage to the auditory nerve, which carries signals from the inner ear to the brain. Stem cells can help restore this nerve by:
Regenerating nerve tissue: Stem cells injected into the damaged nerve can stimulate its regeneration or even differentiate into nerve cells, replacing the damaged areas.
Securing neurotrophic factors: These substances promote the growth and restoration of nerve cells, improving the transmission of signals from the ear to the brain.
3. Immunomodulation and reducing inflammation
In some types of hearing loss associated with inflammation (such as autoimmune otitis media), stem cells can help by suppressing excess inflammation and creating an environment conducive to tissue repair.
4.Using Mesenchymal Stem Cells (MSCs)
Mesenchymal stem cells, derived from bone marrow, adipose tissue, or umbilical cord blood, have significant anti-inflammatory and regenerative properties. MSCs can be used to treat hearing loss by:
Releasing growth factors: Stimulating the regeneration of inner ear tissue.
Remodeling damaged tissue: Promoting the restoration of inner ear structure and nerve fibers.
5. Stem Cell Delivery Approaches and Methods
The effectiveness of stem cell therapy depends on the delivery methods. Possible approaches include:
Local administration into the cochlea: Allows cells to be delivered directly to the site of injury.
Systemic administration: Introducing stem cells through the blood or other routes so that they reach the inner ear area.
Stem cells have great potential to restore hearing due to their ability to regenerate damaged inner ear cells, repair the auditory nerve, and reduce inflammation.
What stem cells do we use in hearing restoration therapy
We recommend using local injections or a combination of local and intravenous injections of stem cells:
Neural cells (neural crest cells, or neuroblasts of embryonic origin) – (restoration of hair sensitivity to sound stimuli)
Microvascular endothelial cells – (increase in neogenesis, proliferation of microvessels in damaged tissue areas)
Deep tissue regeneration exosomes – (activation of damaged cells, renewal of function)
Success rates of stem cell therapy for hearing loss:
Partial hearing regeneration: This includes improved sound perception at certain frequencies.
Reduction in tinnitus: reduction in tinnitus after stem cell treatment, which also contributed to an improvement in overall quality of life.
Recovery may vary depending on the degree and cause of hearing loss.
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