The danger stage of a fever is generally considered to be when the temperature reaches 103°F (39.4°C) or higher.
At this point, it's crucial to seek medical attention, particularly if the fever persists for more than three days or if you experience any worsening or new symptoms alongside the fever. While a fever is a natural response to infection, very high temperatures can indicate a serious underlying condition or lead to complications. It's also important to note that even lower grade fevers can be cause for concern depending on the individual.
Therefore, keep an eye on your temperature and be sure to seek medical attention if you have any concerns.