The common causes of echoes in the right ear are as follows: 1. One of the main causes is the invagination of the eardrum, and the other is caused by the dysfunction of the eustachian tube. You can use nasal spray drugs, such as Daphnin or Nesuna to relieve the swelling of the nasal mucosa, and the symptoms can be improved by blowing the eustachian tube. 3. Inflammation of the ear itself, such as otitis media, can also cause this condition, mainly by using local anti-inflammatory ear drops, such as Telbital ear drops for external use, and the symptoms will be gradually relieved after the inflammation subsides.