When gums are tender, red, swollen and/or bleeding; gum disease is quite often looked to as the culprit. However, there are other reasons gums may be “acting up”. Even if no discomfort is experienced, it is incredibly important to visit the dentist so the source of the symptoms can be addressed. So what causes gums to turn red? Swell? Bleed? Read below for possible causes of irritated gums.