My father (age 65) experiencing clicking sound swallowing anything without any pain since 15 days consulted ent specialist conducted xray test found nothing then doctor said nothing to worry about it happens in old age and even if the sound didn't go no problem it is not threatening and then prescribed (1) cadila vitamin d3 calcium citrate malate tablet 30 tablets � 30 days (2) rexidin mouthwash (3) zerodol sp 8 tablets � 3 days but I didn't take zerodol because it is for pain and my doesn't have any pain so I skipped it. So I want to know what is this? I didn't clearly understand what the doctor said please explain why this clicking sound only he can hear this sound when it'll go? Please reply?