Swollen gums are one of the common symptoms in dentistry. Some people have frequently swollen and bleeding gums, often found in the morning or at night while brushing their teeth. There are many causes of swollen gums, and many diseases can cause swollen gums. 1. Fibrous hyperplasia When suffering from this disease, the gums swell and in severe cases gingival hyperplasia occurs, which may even cover the teeth. The large, hard, painless fibrous hyperplasia tissue wrapped around the surface of the teeth can interfere with tooth eruption, causing labial protrusion and chewing difficulties. 2, Leukemia Gum swelling is a common early manifestation of leukemia. Especially in acute monocytic, lymphocytic or granulocytic leukemia. It often manifests as localized swelling or with necrosis. The tender gums turn blue, shiny and bleed easily. 3.Vitamin C deficiency (scurvy) In this case, the gums are soft and edematous, spongy, and the gingival papillae appear red or purple. The gums are prone to bleeding and swelling. Oral examination reveals cystic pockets of gums between loose teeth that are filled with blood clots. Other symptoms include loss of appetite, pallor, dry mouth, scaly dermatitis, fatigue, drowsiness, insomnia, and signs of abnormal bleeding. 4. Other etiologies Medications. The anticonvulsant phenytoin sodium often causes swelling of the gums. Cyclosporine, a drug used to prevent rejection of organ transplants, has caused gingival swelling in about 15% of patients after administration.