Humming can be subtle, or more complex
It can be in quick bursts, or follow a larger pattern, such as humming to a tune or only ‘feeling right’ after a certain period of time.
For those around the individual, this tic may be mistaken for a desire to hum, or another condition such as ADHD. Despite being a different cause, Tourette often co-occurs with ADHD.
The tic may come from the urge to feel something, not hear something
As well as a desire to hear a humming sound, there may be an urge to feel a vibration in the throat, mouth and/or lips.
Vocal tics do not always come from the urge to hear something, sometimes they come from the urge to feel specific movements and/or sensations.
Diagnosis comes from hearing an individuals experience, provided by a medical professional.