Why do planes affect periods?

Jet lag is likely to affect your cycle Whenever your sleep cycle gets disrupted, there's a possibility for your menstrual cycle to fall out of order as well. If you're switching time zones, your circadian rhythm (the body's inner clock) also falls out of balance.



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Disturbing your circadian rhythm may cause a delay in the oestrogen spike that leads to ovulation, so you'll have a later period than normal that month. Not only can jet lag affect your period but it might cause all kinds of other changes in your body – irritability, exhaustion, stomach upset and a lack of appetite.

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Although some people may notice a change in their menstrual cycle and ovulation during or after a trip, the majority are unaffected. Travel can certainly agitate and manipulate the timing of ovulation, but so can just about anything that causes a lot of stress.

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