Ringing in one ear, also known as tinnitus, can be caused by a variety of factors. Here are some of the most common causes:

• Age-related hearing loss: As people age, they may experience hearing loss, which can lead to tinnitus.
• Exposure to loud noises: Exposure to loud music or working in a noisy environment can cause hearing loss and tinnitus.
• Medications: Certain medications, such as aspirin, diuretics, and certain antibiotics, can trigger ringing or make it louder.
• Earwax buildup: If earwax doesnt wash away on its own and too much piles up, it could lead to ringing or hearing loss.
• Ear infection or ear canal blockage: A blockage can change the pressure in your ear, causing tinnitus.
• Head or neck injuries: Head or neck trauma can affect the inner ear, hearing nerves, or brain function linked to hearing, and usually cause tinnitus in only one ear.
• Problems with the jaw bone: Problems with the temporomandibular joint can cause tinnitus.
• Other medical problems: These include changes in your inner ear bones, an inner ear disorder called Menieres disease, or head and neck injuries.

Tinnitus can also be a symptom of other conditions, such as high blood pressure or chronic health conditions. If you have ringing in one ear that lasts longer than three months, you should talk to your doctor to determine the underlying cause and appropriate treatment.