Tinnitus (/ˈtɪnɪtəs/ or /tɪˈnaɪtəs/) is the hearing of sound when no external sound is present. While often described as a ringing, it may also sound like a clicking, hiss or roaring.
https://en.wikipedia.org/wiki/Ear_ringing
The following drugs, medications, substances or toxins are some of the possible causes of Ringing in ears as a symptom. Always advise your doctor of any medications or treatments you are using, including prescription, over-the-counter, supplements, herbal or alternative treatments.
http://www.rightdiagnosis.com/sym/ringing_in_ears.htm
One of the most common causes is noise-induced hearing loss. Other causes include: ear infections, disease of the heart or blood vessels, Meniere's disease, brain tumors, exposure to certain medications, a previous head injury and earwax. It is more common in those with depression. The diagnosis is usually based on the person's description.
https://en.wikipedia.org/wiki/Ear_ringing
Tinnitus can arise in any of the four sections of the hearing system: the outer ear, the middle ear, the inner ear, and the brain. Some tinnitus or head noise is normal. A number of techniques and treatments may be of help, depending on the cause. 1  Some of the most common include a sound of crickets or roaring, buzzing, hissing, whistling, and high-pitched ringing.
http://www.emedicinehealth.com/tinnitus/article_em.htm
People with tinnitus perceive buzzing, roaring, and pulsitile sounds when no actual sound is present. Tinnitus can arise from problems in any of the four areas responsible for hearing: the outer ear, the middle ear, the inner ear, and the brain. Tinnitus is often accompanied by hearing loss.
http://www.medicinenet.com/ringing_in_ears/symptoms.htm
Research the causes of these symptoms that are similar to, or related to, the symptom Ringing in ears: 1  Hearing loss (271 causes). 2  Deafness (1048 causes). 3  Hearing symptoms (1100 causes). 4  Ear symptoms (1999 causes). 5  Hearing voices (7 causes). 6  Ativan withdrawal.
http://www.rightdiagnosis.com/sym/ringing_in_ears.htm
Tinnitus, (pronounced tih-NIGHT-us or TIN-ih-tus) is a ringing, swishing, or other type of noise that seems to originate in the ear or head. Most of us will experience tinnitus or sounds in the ears at some time or another.
http://www.emedicinehealth.com/tinnitus/article_em.htm
Learn causes, symptoms, relief remedies, treatments and prevention tips for Tinnitus (ringing in the ears) through this slideshow...learn more ».
http://www.medicinenet.com/ringing_in_ears/symptoms.htm
Obstructions in the Middle Ear. Blockages in the ear canal can cause pressure to build up in the inner ear, affecting the operation of the ear drum. Moreover, objects directly touching the ear drum can irritate the organ and cause the perception of tinnitus symptoms. Common obstructions include: 1  Excessive ear wax (ceruminosis). 2  Head congestion.
https://www.ata.org/understanding-facts/causes
1 Some of the most common include a sound of crickets or roaring, buzzing, hissing, whistling, and high-pitched ringing. 2  Other types of tinnitus include a clicking or pulsatile tinnitus (the noise accompanies your heartbeat).
http://www.emedicinehealth.com/tinnitus/article_em.htm
what causes ear ringing
Hearing loss is a cause of ear ringing. Ear ringing cause hearing loss.