 [ Symptoms ] two years ago i was diagnosed with colon cancer [ Disease ] excessive gas is commonly seen after colon resection surgery colon resection surgery can cause disturbance in bowel mobility leading to gas you should continue simethicone and along with it you should avoid excessive intake of dairy nuts heavy meal carbonated drinks etc avoid chewing chewing gums as they cause air entrapment avoid eating too fast activated charcoal pills can also help but only after advise from your doctor hope this helps regards