Guilt is the uncomfortable emotional response to the recognition that you have done something that conflicts with your values or has harmed someone. Unlike shame, which is about identity, guilt is about behavior. It is the feeling associated with 'I did something wrong' rather than 'I am wrong.'
Healthy guilt serves an important function. It motivates repair. It signals that something you did conflicted with your values and that acknowledgment, apology, or restitution is appropriate. It is part of what makes trustworthy relationships possible.
Unhealthy guilt is disproportionate to the actual behavior, persists long after appropriate repair has been made, or arises in response to things that are not actually wrong, like having needs, setting limits, or prioritizing your own wellbeing.
Chronic guilt, particularly in people who have experienced environments where they were regularly held responsible for things beyond their control, often has little connection to actual wrongdoing. It is a habit of self-blame that became automatic.
The useful question with guilt is: did I actually do something wrong? If yes, what repair is appropriate? If the guilt persists after appropriate repair, or if it arises around things that are not actually harmful, it is worth examining its source.