Does Underweight Affect Period?

Losing too much weight can cause periods to be less regular or stop completely. This can happen if your body fat drops so low that you stop ovulating, or releasing an egg from an ovary each month.

Can being underweight affect periods?

If you're underweight, it can also affect how your hormones work. This means your periods could be delayed if they have not started yet or, if they have started, you could miss some.

Can underweight cause irregular periods?

Both extremes — underweight and overweight/obese — can lead to variations in the menstrual cycle due to de-regulation of hormonal pathways. However, even the smaller changes in weight not placing us in another BMI zone may be strong enough to cause shifts in our hormones and as a consequence changes in our cyclicity.