A prognosis is an educated guess. It is a prediction about how a health condition will develop in the future. A health provider will estimate what might happen to a person’s health over time, based on things like the type of illness, how severe it is, and the person’s overall health. The prognosis can give an idea of how long someone might be sick, how likely they are to get better, or if they might face complications. However, it’s just an estimate and can change depending on how the person responds to treatment or other factors.