Can fever delay periods?

While it is possible that a fever could delay periods, it is also possible that the opposite could be true. Many women report getting their periods while they are sick with a fever. It's hard to say definitively which is responsible for delaying or causing periods - the fever or the illness itself.

In general, however, anything that disrupts the normal balance of hormones in the body can lead to changes in menstrual timing. This includes things like stress, travel, and sudden weight loss or gain. So it's likely that fever (or any other illness) could delay periods in some cases.