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Thank you for this information. What is your question please?
Thanks. No it is not normal for a period to disappear, normal is having a regular period.
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PCOS is one reason but there are others. Anovulation can cause this, and this can be due to stress, weight gain, weight loss, hypothyroidism as well as ovarian failure.
Blood tests can be used to exclude all of these.
If these are all normal, then this is 'normal' for you. Therefore you do not need to do anything, but if you did want to regulate your period then this could be done with a hormonal contraceptive.
Full blood count, Liver Function, Renal Function, Thyroid function, Follicle Stimulating Hormone, Progesterone