Voiding, yes, at least here is the medical term for urination. But in terms of all the other possibilities also mentioned (the 'food poisoning' analogy) I think it's common sense, perhaps more a consequence physiologically of stress, anxiety and the like. For example panic attacks, chest pressure and/or pain, irregular heartbeat, tense muscles (even dislocations), elevated (or decreased) blood pressure, impaired immune function, nausea, ulcers and bleeding ulcers, fainting, hives, shakes, autoimmune disorders, etc. Whether they be situational or prolonged, or in response to elevated stress or a consequence of prolonged levels of it (kindey damage, for example), or a consequence of poor or absent self care or damaging coping mechanisms (eg substance abuse to try to cope) I think it's inevitable. The mind and body are intimately contected, even if we don't recognize it or acknowledge it. (Much as a stressor and stress response can go underground, and appear later, or blow up at the time, or not be recognized at all until we look back, or our body gives out). JMHO though. For example, I think I've got a bleeding ulcer (again). Thats going to throw a lot of things off, in terms of systems and processes, how I feel and also what I choose. It is perhaps a combo of nature and nurture, propensities and situations and choices, then it shows up in different (varied) ways.
ETA, there is also much documentation on how there seems to be a link between people who, for example, often subjectively feel broken hearted to having heart problems, or people saying everything is a pain in the as*, to getting for example prostate cancel. But it is critical not to twist that in to blaming, and forget genetics and environment, or what medicine does not know. What is well documented however, is if for example someone says ~'I feel a stabbing pain in my stomach', and no equatable source can be found, but they are asked what else feels like a 'stabbing pain' (and they say for eg their relationship with their child), then talking about that problem can reduce or stop the pain in their stomach in many cases. Quite the connection, if you think about it.