There are mainly the following clinical causes of external auditory canal congestion. The first is acute congestion of the external auditory canal, which is clinically manifested by redness and swelling of the ear canal, obvious congestion, severe ear pain, and possibly some changes related to hearing loss, which is mostly induced by bacterial infection. The second condition is dark red congestion of the external ear canal, which is generally not very obvious. This condition is usually related to chronic otitis externa, which is often associated with the patient’s repeated ear pulling or some fungal infections in the ear canal. Clinically, the pain in the ear canal is not obvious, and the patient may have itchy ears, stuffy ears, and discomfort in the ear as the main complaints.