Tinnitus hum, but it can also arise as a subjective phenomenon from an increased awareness of blood flow in the ear. Rarely, pulsatile tinnitus may be a symptom of potentially life-threatening conditions such as carotid artery aneurysm or carotid artery dissection. Pulsatile tinnitus may also indicate vasculitis, or more specifically, giant cell arteritis. Pulsatile tinnitus may also be an indication of idiopathic intracranial hypertension. Pulsatile tinnitus can be a symptom of intracranial vascular abnormalities and should be evaluated for "irregular noises of blood flow" (bruits). The mechanisms of subjective tinnitus are often obscure. While it is not surprising that direct trauma
Tinnitus retraining therapy The patient is taught the basic knowledge about the auditory system and its function, the mechanism of tinnitus generation and the annoyance associated with tinnitus. The repetition of these points in the follow-up visits helps the patient to perceive the signal as a non-danger. Measuring the efficacy of TRT is beset by confounding factors: tinnitus reporting is entirely subjective therefore not reliable; tinnitus or at least subjects' perception of it varies over time and repeated evaluations are not consistent. Researchers have noted that there is a large placebo component to tinnitus management. In many commercial TRT practices, there is a