Question

Why earphones are harmful ? answer the question atleast for 75, words

Answer 1

During the past decade, the damagingeffects of excessive noise pollution from portable stereo earphones have gained attention. If you can hear the sound being delivered into a person's ear via headphones or earphones, it indicates the sound is too loud and over an extended period can lead to permanent hearing loss.

Answer 2

Congratulations on getting deaf at the age of just 45! Listening to music at a maximum volume will make you look cool and stylist but sorry guys when you will start wearing “Hearing Aids”, you will look old and pitiful. Why giving your ears torture; it too needs to breathe and relax. The sound waves therefore becomes shock waves when you listen to something loudly for long hours.

Excessively high volume level may result trauma to cochlear structure in the inner ear which will effect temporary or permanent hearing impairment or deafness. The louder the music, the lesser amount of time it takes for Noise-induced hearing loss(NIHL).

Loudness of music is measured in “DECIBELS”. If you listen to anything under 85 decibels, that is normal. But if you start exceeding beyond 85 decibels, man you are in trouble. The sound waves thus will start effecting your eardrums and will gradually effect your ears.

DO NOT HARM YOUR EARS BY:-

-Listening to music eight hours a day at 85 decibels

-Listening to music continuously for 5-6 hours at 90 decibels

Though there are plethora of problems resulting because of listening to loud music but I've come across of following :
Tinnitus 
Dr. Martine Hamann of the University of Leicester in the UK recently discovered that exposing your ears to loud sounds can trigger uncontrolled activity in the neurons of the dorsal cochlear nucleus. (The dorsal cochlear nucleus is the area of your brain that relays signals from your ears to other parts of your brain that decode and make sense of the sounds you are hearing.)



Normally neurons receive a sound signal, fire and then return to a state of rest. This happens because potassium channels help “drag down the cellular electrical activity to its resting state”.  This allows neurons to function in regular patterns in response to sound signals.
However, loud noises inhibit the potassium channels’ ability to properly regulate excess neuronal activity. In normal conditions the channel helps to drag down the cellular electrical activity to its resting state and this allows the cell to function with a regular pattern. After exposure to loud sound, the channel is functioning less and therefore the cell is constantly active, being unable to reach its resting state and displaying those irregular bursts.This means these neurons do not return to their resting state. Instead, they “fire continuously in random bursts, creating the sensation of constant noise where none exists.” This resulting noise is tinnitus. I have a complete pdf file of this research if you want.
Tinnitus Key Cellular Mechanisms Identified

Multiple Sclerosis
Yes it may sound terrifying but it's true. Dr. Martine has also shown that loud music through earphones can wear off the myelin sheath, something that occurs in multiple sclerosis. But if the causative factor is removed (in this case the loud music through ear phones) then it can be cured. The myelin sheath can  regenerate but it takes quite a long time.
Earphones potentially as dangerous as noise from jet engines, researchers find

Earphones are not harmful. Loud noise is. Loud noise levels for a long period of time are harmful. With earbuds, its not the sound but the entitlement to listen to your content at any place which is harmful.

Earphones do just one thing.They bring the source of sound closer to the ear canal, which effectively increases the intensity received by our ears without increasing the decibels emitted by the earpiece.

Human ears are comfortable between 60–75 db of perceived loudness even for moderately long periods of time. Hence whenever using earphones make it a rule to never set the volume greater than 60–70% of the maximum output volume available in the device.