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Earache is a very common problem and happens to both children and adults. It happens due to several reasons like infection in the ear, nose and throat, pressure difference during flights, injury and or pressure on or in the ears, excessive wax clogging the ear passage, cold and cough, exposure to loud music or sound, insect in the ear, etc...

If you are suffering from an unexplained pain behind your knee, you should first try and examine the reason for this. Since you have not mentioned your age or gender, there could be any number of possibilities that would suffice as reasons for this...