Tinnitus may be classified in two types&colon; "subjective tinnitus" and "objective tinnitus". Hyperacusis can also be accompanied by tinnitus. Neurologic effects include dizziness, loss of balance, seizures, and tinnitus. HPDs can also protect against other effects of noise exposure such as tinnitus and hyperacusis. Common ADRs include&colon; headache, dizziness, drowsiness, confusion, visual disturbances, tinnitus, tremor, and/or paraesthesia. "Hyperacusis" is often coincident with tinnitus. Letterman suffers from tinnitus, a symptom of hearing loss. An assessment of hyperacusis, a frequent accompaniment of tinnitus, may also be made. There are several approaches for tinnitus sound therapy. It is unclear if anticonvulsants are useful for treating tinnitus. Straw has suffered from depression and tinnitus. Audiologists are trained to diagnose, manage and/or treat hearing, tinnitus, or balance problems. Shields has mild dyslexia, "mild to extreme" tinnitus, and tendonitis in his left hand. It decreases the amount of stress those with tinnitus feel. Palmer is also shown to have severe tinnitus.