What could cause swollen receding gums?

Bactrial infection: If the bacteria is not removed regularly it can penetrate under the gums and cause deep pockets, the bacteria will attack the bone and will cause bone infection and the gums loose their support, as the pockets get deeper, the infection can cause recession and swelling of the gums as well. It is important to have a good oral hugiene and pregular dental visits for gum and teeth maintenance.