It may be cause of gingivitis. I would recommend that you book an appointment with a dentist to assess your gum .Gingivitis is a mild form of gum disease that can usually be reversed with daily brushing and flossing, and regular cleaning by a dentist or dental hygienist. This form of gum disease does not include any loss of bone and tissue that hold teeth in place.
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more then likely yes, but it could be some built up decay. go see your dentist and let them treat you as needed
if your gums are swollen and bleed yes you have gum disease.