Bumblefoot (ulcerative pododermatitis) is a common bacterial infection and inflammatory reaction that occurs on the feet of birds, rodents, and rabbits.
[2] Lameness puts more weight-bearing duty on an animal's strong leg(s); this leads to excessive pressure being placed on the good foot (or feet), which increases the chance of an abrasion occurring that could develop a bumblefoot infection.
[2] Overweight animals are more at risk of developing bumblefoot for the same reason; their extra weight causes excessive pressure on their feet.
Due to constant walking on hard, rough, or sharp surfaces, birds can develop small wounds on the bottom of their feet.
[5] Bumblefoot is so named because of the characteristic "bumbles"[citation needed] or lesions, as well as swelling of the foot pad, symptomatic of an infection.