I am finding more and more resources that indicate that heavy metal poisoning can cause tinnitus. Of course, this may not be the cause of your tinnitus, but ya never know! So, I am now doing therapy for that possibility. Tooth fillings, fish, smoking, vaccinations, etc. can all contribute to this poisoning. Here are some links for you to do your own research. http://www.jeffreywarber.com/hc pages/tinnitus.html http://www.heavymetaldetox.net/Research Articles/Dr Dietrich Klinghardt/ http://www.drgruenn.com/heavy-metal-detox What are the Symptoms of Heavy Metal Toxicity? As Heavy Metals affect many organs and functions of the body, they elicit complaints and symptoms that are different from person to person and do not easily fit into the usual diagnostic categories. Therefore they often are difficult to diagnose. Here are some of the symptoms of chronic mercury toxicity: Nervous System: Irritability, low concentration, memory loss, insomnia, depression, anxiety, tingling of the extremities, tremors, disturbed sense of smell and taste (metallic taste), unexplained burning sensation or numbness, pain, headaches, fatigue, tinnitus. Immune System: Chronic or frequent viral, bacterial or fungal (Candida) infections, autoimmune disorders, allergies. The EPA has determined that methyl-mercury is a possible human carcinogen. Cardiovascular: Abnormal heart rhythm, high blood pressure, cardiomyopathy. Skin: Eczema, allergies. Endocrine System: Hypothyroidism, hypoglycemia, adrenal disease, infertility. Gastrointestinal: Food sensitivities, bacterial or fungal overgrowth, recurrent parasitic infections, abdominal cramps, irritable bowl symptoms. Systemic: Premature aging, fatigue, fibromyalgia.