tinnitus; ringing in the ears
Medical term for the perception of noise or ringing in the ears. Commonly used in everyday conversation as well.
Lately, my tinnitus has been so bad I can't sleep.
The cause of the ringing in my ears might be stress.
Compound of 耳 (mimi, 'ear') and 鳴り (nari, 'ringing, sound'), from the verb 鳴る (naru, 'to ring, to sound').