There are various reasons for ear stuffiness, as follows: 1. It may be caused by water in the ear after washing hair, bathing or swimming. 2. Some patients may have large cerumen masses blocked in the ear canal, which also tend to trigger a feeling of stuffiness, especially when the cerumen absorbs water and swells, which can cause a more intense feeling of stuffiness. 3. Patients with colds or respiratory infections may further develop This can also lead to a feeling of stuffiness and swelling in the ear. 4. Sudden deafness may occur, often related to viral infections, overexertion, poor mood and other factors, and can lead to a feeling of stuffiness and swelling in the ear, sensorineural hearing loss, tinnitus, vertigo and other related symptoms, which require further detailed examination to determine the cause.