Hello and Welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice. Yes, it is possible to pass a small amount of feces without knowing that it actually happened. This usually happens in the following conditions: - Leakage due to sliminess due to excessive mucus production. The cause has to be found out by a stool test and colonoscopy with biopsy if required. - Loose anal sphincters. - Prolapsing piles. - Any sort of trauma locally. - Severe forceful coughing and sneezing and for that matter, any activity that increases intra-abdominal pressure suddenly. Get a consultation with a general surgeon for local and general examination and scopies as indicates to find the cause and get treated accordingly. Hope I have answered your query. Let me know if I can assist you further. Regards, Dr. T Chandrakant