unless you have a specific sensitivity or allergy to milk products milk (or ice cream in this case) does not cause mucous. because mucous can be thick and sticky milk or ice cream may seem to stick to it in your throat but it doesn't cause it. it was already there. enjoy your evening bowl of ice cream. this is one of life's little pleasures. if you do seem to have some more noticeable phlegm just follow up your ice cream with a glass of water or a cup of tea.
i have servere copd. will eating ice cream in the evening cause mucus?