Why does it feel like after running a mile you have menstrual cramps while your when not on period?

Running can cause uterine contractions, which can feel like menstrual cramps. This is because when you run, your body releases endorphins, which are hormones that have many effects, including causing uterine contractions. Additionally, the impact of running can also put pressure on the uterus, which can further contribute to cramp-like sensations. It is important to note that these cramps are generally harmless and will usually go away after a few minutes. However, if you experience severe or persistent cramps, it is always best to consult with a doctor to rule out any underlying medical conditions.