An acoustic neuroma is a benign tumor that develops on the nerve that connects the ear to the brain. The tumor usually grows slowly. As it grows, it presses against the hearing and balance nerves. At first, you may have no symptoms or mild symptoms. They can include:

• Loss of hearing on one side
• Ringing in ears
• Dizziness and balance problems

The tumor can also eventually cause numbness or paralysis of the face. If it grows large enough, it can press against the brain, becoming life-threatening. Acoustic neuroma can be difficult to diagnose, because the symptoms are similar to those of middle ear problems. Ear exams, hearing tests and scans can help diagnose this condition. If the tumor stays small, you may only need to have it checked regularly. If you do need treatment, surgery and radiation are options.

Source: NIH: National Institute of Deafness and Communication Disorders 

Cochlear hydrops is a form of Meniere’s disease that does not include dizziness as a symptom. It is believed to be excessive fluid pressure in the cochlea of the inner ear. Although an Auditory Brainstem Response (ABR) test and other tests may be performed, there is no specific test to diagnose this condition.

Symptoms include:

• Clogged or fullness sensation in the ear
• Distortion of sound and speech
• Hearing fluctuations
• Roaring sound in the ear
• Sensitivity to high-frequency noise

Treatment consists of dietary changes and restrictions, including no alcohol, no caffeine and low salt. Diuretics may be prescribed if the response to the modified diet is good. 

An inner ear irritation and swelling of the inner ear from a virus or bacteria that leads to vertigo and loss of hearing is called labyrinthitis. It is commonly referred to as an inner ear infection. Your inner ear is located in an area that cannot be seen on physical exam, so a diagnosis is made by history and balance and hearing test results. 

Symptoms of labyrinthitis can include:

• Balance issues
• Dizziness and vertigo 
• Hearing loss 
• Involuntary eye movement and focus problems
• Nausea/vomiting
• Tinnitus (ringing or other noises in your ears)

It can take a week to a few months to completely recover from labyrinthitis. Initial treatment might include a prescription or over-the-counter anti-dizzy medication that should be used only during the period where the symptoms are at their worst (typically the first 24-72 hours). A natural compensation process where your "good" ear will start working harder to make up for the "bad" ear begins the very first week. This compensation process will be delayed if anti-dizzy medications are taken longer than necessary. 

Patients are encouraged to move about as much as safely possible to encourage the compensation process. Sometimes patients need vestibular therapy with a specialized physical therapist to hasten the compensation process. Typically, the more active you are, the faster you get better. 

Even though the vertigo typically lasts one to three days, a patient can feel off balance for much longer in situations that challenge your balance system (e.g., eyes closed in the shower, walking in a darkened room, pivoting corners, quick head movements or trying to shop in large stores). Do not drive, work with heavy machinery or work at heights if you are experiencing dizziness. 

Ototoxicity is poisoning of the cochlear nerve in the inner ear from drugs or chemicals. The nerve itself and hair cells within the ear are damaged, often creating a loss of hearing and balance. Products as common as aspirin and quinine have been known to cause ototoxicity, which reverses once consumption of these products has ceased.

The severity of symptoms usually depends on the level of toxic exposure and can be temporary or permanent. They include:

• Blurred vision
• Constant or fluctuating tinnitus 
• Headache
• Hearing loss in one or both ears
• Loss of balance
• Nystagmus (eye jerking)
• Vertigo 
• Vomiting

Treatments to relieve symptoms include ototoxicity monitoring and hearing aids. Cochlear implants have been successful in treating total hearing loss. 

Inside the ear is a thin membrane that separates the middle ear from the fluid-filled space of the inner ear. A perilymph fistula (PLF) is a tear in the membrane that causes the fluid to leak into the middle ear.

PLF symptoms include:

• Dizziness
• Ear pressure
• Inconsistent hearing
• Motion sensitivity
• Sound sensitivity
• Sudden hearing loss
• Vertigo 

PLF symptoms increase with pressure and elevation changes in airplanes and elevators and when mountain climbing, or as a result of lifting heavy objects or even just bending over, coughing and sneezing.

PLF is usually caused by a head injury and sometimes by a perforated eardrum, but even activities like being a passenger on a plane that is ascending or more likely descending, giving birth, scuba diving and weightlifting can cause PLF. 

SSCD is an opening (dehiscence) in the bone located over the superior semicircular canal of the inner ear. This opening allows the fluid in the canal to be displaced by pressure and sound. SSCD is believed to be a developmental abnormality inherited at birth.

Some of SSCD symptoms can be brought on by coughing, loud noises, sneezing and straining and can include any or all of the following:

• Autophony (increased, sustained volume of your own voice)
• Sound hypersensitivity
• Conductive hearing loss
• Vertigo 
• Oscillopsia (the perception that still objects are moving)

Many patients are able to manage symptoms by avoiding the things that aggravate their condition, like loud noises. For others, surgical repair of the dehiscence (plugging of the canal with fibrous tissue) can be very beneficial. However, hearing loss can be a risk for those who have had prior SSCD surgery. 

Viral infection or, less commonly, bacterial infection can inflame the nerves connecting the inner ear to the brain, resulting in vestibular neuronitis.

Vestibular neuronitis is very similar to labyrinthitis. However, vestibular neuronitis typically does not cause hearing loss. The symptoms can vary in severity:

• Dizziness to a violent spinning sensation (vertigo) 
• Imbalance
• Impaired concentration
• Nausea
• Vision problems
• Vomiting

Medications help control nausea and dizziness. Antibiotics, antiviral drugs or steroids may also be prescribed. Rehabilitation exercises that retrain the brain to adjust to vestibular imbalance may also be necessary in long-term cases.

Chronic benign paroxysmal positional vertigo (BPPV) may also develop from the neuronitis.