Gingivitis is a mild form of gum disease caused by bacterial buildup that results in red, swollen, and bleeding gums. It is usually caused by poor dental hygiene, smoking, uncontrolled diabetes, or a family history of dental disease. Symptoms include bleeding gums, mouth sores, bad breath, and swollen gums. Treatment focuses on antibiotics, pain medication, mouthwashes, improving oral hygiene, nutrition, and preventing further bacterial buildup.