"Tinnitus may improve spontaneously. In 1 cohort study,
nearly
50% of patients with significant tinnitus (moderate
severity, sleep problems, or both) improved after 5 years, with
43% of those improved reporting complete resolution and the
remaining 57% reporting only mild symptoms.
In another study, 82% of patients who reported tinnitus at baseline had persistent tinnitus after 5 years, suggesting close to a 20% rate of spontaneous improvement. Similarly, subjects assigned to the "wait-list" control groups of some clinical trials show small, but
significant, improvements in tinnitus distress. The largest spon-
taneous improvement is seen with short duration tinnitus, younger
age, and longer intervals between pre- and post-assessment. For
example, in 1 study, 28% of subjects with acute tinnitus (last-
ing < 6 months) improved spontaneously in a control group that
received only educational information.
The severity of tinnitus can fluctuate. Hallam et al. reviewed the psychological aspects of tinnitus and described a natural habituation process that improves tinnitus tolerance. An observational study of 528 patients seen in otolaryngology clinics found that, regardless of symptom duration, tinnitus severity declined over time in 3% to 7% of patients. Another large cohort study found that 55% of patients with severe tinnitus reported only moderate, or mildly bothersome, symptoms 5 years later."
Looks like about 20%-30% of those who get Moderate tinnitus, eventually recover. However, for those whose symptoms have been improving, it is likely that the probability of recovery is higher than that (it is probably closer to 43% [so 40%-50%], see above). If initially you had only minor tinnitus, your chances of recovery are probably a lot higher...