Boreiko, C J.; Abernethy, D J.; and Frazelle, J H., Detection of carcinogens which initiate the process of c3h/10t1/2 cell transformation. Abstr. (1982). Subject Strain Bibliography 1982. 2148. https://mouseion.jax.org/ssbb1982/2148
Hi Sue, The ringing in the ears is called Tinnitus. It can be a side effect of medications (check what you are taking) or for me, it can also be a sign that a migraine is on the way. It could also mean a number of many other things, depending on other symptoms you may have.
WebMD Symptom Checker helps you find the most common medical conditions indicated by the symptoms headache, nausea or vomiting, pain or discomfort and ringing in ears including Chronic sinusitis, Tension headache, and Constipation (child). There are 122 conditions associated with headache, nausea or vomiting, pain or discomfort and ringing in ears.