It could be loads of things. Firstly just to check – are you sexually active and have you done a test? Otherwise its perfectly normal for periods to be irregular at that age – when did you start? I found it took 7 years for them to settle. They can also be highly effected by stress – as can hair loss. Do you have exams coming perhaps? Even if you don’t feel v stressed it could be your body telling you you are. Oh and worrying about hair loss doesn’t help as you just get more stressed. It is normal to lose over 100 hairs a day. Take some Kelp and eat healthy – all your vitamins, protein and oils – (its really good for your hair) and go see your doc if you want to put your mind at ease. Also you could consider taking the pill to get your periods more regular.

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Are you eating a healthy diet, i don’t want to accuse you of anything but they can be signs of anorexia.

go doctors

hmmm… the hair loss is the serious part. dont worry about your periods. it is normal for them to be irregular for the first few years after you get them. the hair loss on the other hand?
you really must see a doctor.

you shouldnt be asking people here you should go to the doctors already, the irregular periods dont sound serious but the hair loss, please get checked out