Sounds occurring in the ears without an external source is a symptom of tinnitus, according to Healthline. There are two types of tinnitus: objective and subjective. Objective tinnitus occurs when several people hear a particular noise in their ears; subjective tinnitus occurs when only one person hears the noise.
Tinnitus may result from listening to loud music or working with noisy equipment, such as chainsaws or jackhammers. It may also result from using certain medications, including aspirin, water pills and antimalaria drugs. Furthermore, excess earwax can cause temporary tinnitus, states Healthline. Treatment for tinnitus varies according to the underlying cause.