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This sound may be symptom of your schizo-affective illness. In such illness people may hear different kind of sounds which is known as auditory hallucination
. Nature of sound depend on the lefe history and development of that person.
First, do not worry about that.
Second, It is better if you report these sounds to your psychiatrist
so that he can take appropriate steps to reduce or stop them.
I hope this information has been both informative and helpful for you.
Wish you Good Health.
Dr. Ashish Mittal