Head Injury - tinnitus can arise even when head is injured because off a fall, car accident, or the like. The reason is probably the greater or lesser damage to certain parts of the brain that are directly or indirectly linked to the auditory center.
Stress - heavy stress load can also cause tinnitus, also the mechanism in this cause is not fully understood, but I believe that the instability of the chemical environment of the brain in severe stress can obviously affect the functionality of the inner ear, or audio center in the brain.
Problems with the cervical spine can cause tinnitus too. These is usually healed by visiting a qualified chiropractor.
