Is it Tinnitus? Tinnitus is commonly described as a ringing in the ears. But it also can sound like roaring, clicking, hissing, or buzzing. It may be soft or loud, high pitched or low pitched. You might hear it in one or both ears. In the past year, experts estimate that 22.7 million adult Americans experienced tinnitus for more than three months, which is roughly 10 percent of the adults of the United States.
What causes Tinnitus?
Tinnitus (pronounced tin-NY-tus or TIN-u-tus) is not a disease. It is a symptom that something is wrong in the auditory system, which includes the ear, the auditory nerve that connects the inner ear to the brain, and the parts of the brain that process sound. Something as simple as a piece of earwax blocking the ear canal can cause tinnitus. But it can also be the result of a number of health issues, such as:
- Noise-induced hearing loss
- Ear and sinus infections
- Diseases of the heart or blood vessels
- Meniere’s disease
- Brain tumors
- Hormonal changes in women
- Thyroid abnormalities
Tinnitus is sometimes the first sign of hearing loss in older people. It also can be a side effect of medications. More than 200 drugs are known to cause tinnitus when you start or stop taking them.
People who work in noisy environments such as factory or construction workers, road crews, or even musicians can develop tinnitus over time when a lot of exposure to noise damages tiny sensory hair cells in the inner ear that help sends sound to the brain. This is called noise-induced hearing loss.
Soldiers exposed to bomb blasts can develop tinnitus if the shock wave of the explosion squeezes the skull and damages brain tissue in areas that help process sound. In fact, tinnitus is one of the most common service-related disabilities among veterans returning from Iraq and Afghanistan.
Pulsatile tinnitus is a rare type of tinnitus that sounds like a rhythmic pulsing in the ear, usually in time with your heartbeat. A doctor may be able to hear it by pressing a stethoscope against your neck or by placing a tiny microphone inside the ear canal. This kind of tinnitus is most often caused by problems with blood flow in the head or neck. Also, pulsatile tinnitus may be caused by brain tumors or abnormal brain structure.
Even with all of these conditions and causes, some people get tinnitus for no reason. Most of the time, tinnitus isn’t a sign of a serious health problem, although if it’s loud or doesn’t go away, it can cause fatigue, depression, anxiety, and problems with memory and concentration. For some, tinnitus can be a source of real mental and emotional trouble.
Why do I have noise in my ears?
Although we hear tinnitus in our ears, its source is really in the brain cells (what scientists call neural circuits) that make sense of the sounds our ears hear. A way to think about tinnitus is that it often begins in the ear, but it continues in the brain.
Scientists still haven’t agreed upon what happens in the brain to create the illusion of sound when there is none. Some think that tinnitus is similar to chronic pain syndrome, in which the pain is still there even after a wound or broken bone has healed.
Tinnitus could be the result of the brain’s neural circuits trying to change due to the loss of sensory hair cells by turning up the sensitivity to sound. Also, this would explain why some people with tinnitus are oversensitive to loud noise.
Tinnitus also could be the result of neural circuits thrown out of balance when damage in the inner ear changes signaling activity in the auditory cortex, the part of the brain that processes sound. Or it could be the result of abnormal interactions between neural circuits. The neural circuits involved in hearing aren’t only for processing sound. They also communicate with other parts of the brain, such as the limbic region, which regulates mood and emotion.
What should I do if I Have Tinnitus?
The first thing is to see your doctor, who will check if anything, such as ear wax, is blocking the ear canal. Your doctor will ask you about your current health, medical conditions, and medications to find out if a condition is causing your tinnitus.
If your doctor cannot find any reason for your tinnitus, you may be sent to an ENT (Ear, Nose and Throat doctor). The ENT will look at your head, neck, and ears. They will also test your hearing to see if you have a hearing loss with tinnitus. You might also be sent to an audiologist who can also test your hearing and evaluate your tinnitus.
What if the sounds in my ear do not go away?
Some people find their tinnitus doesn’t go away or it gets worse. In some cases, it may become so bad that you find it hard to hear, concentrate, or even sleep. Your doctor will work with you to help find ways to reduce the severity of the noise and its impact on your life.
Are there treatments that can help me?
Tinnitus does not have a cure yet, but treatments that help many people deal with the condition are available. Most doctors will offer a combination of the treatments below, depending on how bad your tinnitus is.
Hearing aids often are helpful for people who have hearing loss along with tinnitus. In addition, using a hearing aid adjusted to carefully control outside sound levels may make it easier for you to hear. The better you hear, the less you may notice your tinnitus. Read the NIDCD fact sheet Hearing Aids at http://www.nidcd. nih.gov/health/hearing/hearingaid.asp for more information.
Wearable sound generators
These are small electronic devices that fit in the ear and use a soft, pleasant sound to help mask the tinnitus. Some people want the masking sound to totally cover up their tinnitus, but most prefer a masking level that is just a bit louder than their tinnitus. The masking sound can be a soft shh, random tones, or music.
Tabletop sound generators
Sometimes they use these as an aid for relaxation or sleep. Placed near your bed, you can program a generator to play pleasant sounds such as waves, waterfalls, rain, or the sounds of a summer night. If your tinnitus is mild, this might be all you need to help you fall asleep.
Acoustic neural stimulation
Acoustic neural stimulation is a relatively new technique for people whose tinnitus is very loud or won’t go away. It uses a palm-sized device and headphones to deliver a broadband acoustic signal embedded in music. The treatment helps stimulate change in the neural circuits in the brain, which eventually desensitizes you to the tinnitus. The device shows effectiveness in reducing or eliminating tinnitus in a significant number of study volunteers.
These are sometimes used in people who have tinnitus along with severe hearing loss. A cochlear implant goes around the damaged portion of the inner ear. In turn, it sends electrical signals that stimulate the auditory nerve. The device brings in outside sounds that help mask tinnitus and stimulate change in the neural circuits. Read the NIDCD fact sheet Cochlear Implants at http://www.nidcd.nih.gov/health/hearing/coch.asp for more information.
Sometimes counseling helps you learn how to live with your tinnitus. Most counseling programs have an educational portion to help you understand what goes on in the brain to cause tinnitus. Some counseling programs also will help you change the way you think about and react to your tinnitus. You might learn some things to do on your own to make the noise less noticeable, to help you relax during the day, or to fall asleep at night.
Your doctor may suggest antidepressant drugs and anti-anxiety drugs to improve your mood and help you sleep. Other medications may be available at drugstores and on the Internet as a cure for tinnitus, but none of these have been proven to work.
Can I do anything to prevent tinnitus or keep it from getting worse?
Noise-induced hearing loss is the result of damage to the sensory hair cells of the inner ear. Furthermore, it is one of the most common causes of tinnitus. Anything you can do to limit loud noise by moving away from the sound, turning down the volume, or wearing earplugs or earmuffs will help prevent tinnitus or keep it from getting worse.
What are researchers doing to better understand Tinnitus?
Hearing signals travel to get from the inner ear to the brain and there are many places where things can go wrong to cause tinnitus. So, if scientists can understand what goes on in the brain to start tinnitus and cause it to continue, they can look for those places in the system where an intervention could stop tinnitus.
In 2009, the National Institute on Deafness and Other Communication Disorders (NIDCD) sponsored a workshop that brought together researchers to talk about the condition and develop fresh ideas for cures. During the course of the workshop, they discussed a number of research ideas, such as:
Electrical or magnetic stimulation of brain areas involved in hearing
Implantable devices already exist to reduce the trembling of Parkinson’s disease. In addition, they can do the same for the anxieties of obsessive-compulsive disorder. Similar devices could be made to normalize the neural circuits involved in tinnitus.
Repetitive transcranial magnetic stimulation (rTMS)
This uses a small device that they place on the scalp to make short magnetic pulses. To normalize electrical activity in the brains of people with epilepsy they use this same technique. Trials of rTMS in humans, funded by the NIDCD, are helping researchers find the best places in the brain to stimulate in order to suppress tinnitus. Researchers are also looking for ways to find which people are most likely to respond well to stimulation devices.
- Hyperactivity and deep brain stimulation
Researchers have seen hyperactivity in neural networks after exposing the ear to loud noise. Understanding where in the brain this begins and how it spreads to other areas could lead to treatments that use deep brain stimulation to calm the neural networks and reduce tinnitus.
Resetting the tonotopic map
Researchers are exploring how to use the tonotopic map. This organizes neurons in the auditory cortex according to the frequency of the sound to which they respond. As a result, research has shown a change in the organization of the tonotopic map after exposing the ear to loud noise. So, by understanding how these changes happen, researchers could form techniques to bring the map back to normal and relieve tinnitus.
Where can I find more information:
The NIDCD keeps a directory of organizations that have information on the normal and disordered processes of hearing, balance, smell, taste, voice, speech, and language. Please see the list of organizations at http://www.nidcd.nih.gov/directory.
Use the following keywords to help you search for organizations that can answer questions and provide information on tinnitus:
- Noise-induced hearing loss
For more information, additional addresses and phone numbers, or a printed list of organizations, contact:
NIDCD Information Clearinghouse
1 Communication Avenue Bethesda, MD 20892-3456
Toll-free Voice: (800) 241-1044
Toll-free TTY: (800) 241-1055
Fax: (301) 770-8977
E-mail: [email protected]
Article courtesy of NIDCD and all rights belong to NIDCD.