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Symptoms of disease - hearing impairment

Hearing impairment - full or partial reduction of the ability to detect and understand sounds. Is caused by the wide spectrum of biological and environmental factors. Hearing loss may suffer any organism capable of perceiving sound. The human hearing, making it impossible perception of speech, called the deaf, and the more light degree of hearing loss, impede the perception of speech - hearing loss.

Minimum volume, which can absorb the individual, called the threshold of audibility. In the case of the people and some of the animals, this value can be measured with the help of behavioral audiograms. A record is made of sounds from the very quiet for more than a loud different frequencies, which should cause a reaction of the audited. There are also electro-physiological tests, which can be implemented without the study of behavioral reactions.

The normal threshold of sensitivity to different frequencies is not a constant in all the species of animals. If the sounds of different frequency play with the same amplitude, some will seem to be loud, others quiet, and few between. In the General case, with increasing volume or the amplitude of the sound is better visible. Usually, if the animal uses sounds to communicate, the frequency, used in it, are best hearing aid agencies than the rest. The «settings» exists at many levels of the hearing system, starting with the structure of the ear and ending with the nerves and parts of the brain responsible for processing of sounds.

They say that the individual is suffering a violation of the hearing, if he is worsening perception of the sounds that are usually perceived by the individuals of the species. The people, the term «hearing» is generally used by those who fully or partially lost the ability to distinguish sounds at frequencies of the human voice. The degree of violation is determined by the fact, how much louder than normal level should be a sound to the listener began to distinguish it. In cases of profound deafness, the listener can't discern even the loudest sounds audiometer.

Another parameter, which may develop hearing loss, is the sound quality. People have such disorders are usually identified tests for speech recognition (that is, it must be not only heard, but also understood). Violation of recognition sounds separately from the General weakening of hearing occurs very rarely.

Which diseases there is hearing impairment

Types and causes of hearing loss
Hearing loss is caused by different biological and environmental factors. Usually vulnerable part of the body is the ear.

Conductive hearing loss
The term conductive hearing loss is indicated by a violation hearing in view of absence of normal conductivity of the sound of the outer or middle ear. As the sound perceived only functioning auditory passage, the tympanic membrane and ear bones, that such a hearing is only partial and it is a slight deterioration in the perception of sounds. With conductive hypoacusis speech recognition is not violated if the one who listens can hear it.

The main causes of conductive hearing loss:
- Obstruction of the ear canal
Anomalies of the middle ear:
- The tympanic membrane
- PIP

Sensorineural hearing loss
The cause of neuro-sensory baryecoia is a violation of the sensitivity of the inner ear (cochlea) or the violation of the auditory nerve. Such violations can lead to deafness all the degrees, from mild to severe and even to a complete loss of hearing.

Most cases of neuro-sensory baryecoia is because of pathology hair cells corti body of the cochlea. There are cases of neuro-sensory baryecoia by reason of pathology VIII cerebral nerve or in parts of the brain responsible for hearing. In rare cases, this type of hearing loss affects only the auditory centers of the brain (Central hearing loss). In this case the person has normal hearing, but the sound quality is so poor, that he is not able to make out the human speech.

Most of hearing with neurosensory hearing loss may occur because of the pathology of the functions of the hair cells. This pathology can be both congenital and acquired. The causes of this pathology can be as infection or noise trauma, and genetic predisposition.

Prolonged exposure to noise
People who live near airfields or highways are subjected to continuous wave radiation intensity of about 60 to 70 dB. If in such circumstances, a person spends a long time on the street or at home with the Windows open, then gradually he may develop a weakening of hearing.

Genetic hearing loss
Hearing loss can also be genetically determined. For congenital deafness is responsible as the dominant, and the recessive gene, which may be the cause of deafness from moderate to heavy manifestations. if a gene responsible for deafness, is a dominant, then it will manifest itself in every generation. When recessive the gene for hearing loss disease will manifest itself in every generation.

Which doctor should I contact if there is a hearing impairment

• ENT
• An otholaryngologist

Are you experiencing hearing impairment? You want to know more detailed information, or you need an inspection? Please sign up on reception to the doctor! Doctors will examine you, examine the external signs and help to determine the disease the symptoms, they will consult you and provide the necessary assistance. You can also call the doctor on the house.

Do you feel hearing disrupted? You should be very careful approach to your health in general. People pay not enough attention to the symptoms of the disease and don't realize that these diseases can be critically dangerous. There are many diseases that in the beginning didn't manifest in our body, but in the end it turns out, unfortunately, it have already been treated too late. Every disease has its own specific features typical symptoms - called symptoms of the disease. Definition of symptoms is the first step in the diagnosis of diseases in general. You just need a few times a year to be screened by a doctor, not only to prevent a terrible disease, but also to maintain a healthy spirit in a body and the organism in general.

Disorders by category

Disorders by alphabet

Map of the symptoms and the types of disorders is intended solely for educational purposes. We strongly recommend do NOT self-medicate; on all matters relating to the definition of the disease and ways of its treatment, contact your doctor. Md-tips is not responsible for the consequences of use information posted on the site.