I'm a young female aged 25. often when i'm on menstruation (periods) i get nausea, sweat, vomit, become weak and suffer from severe period cramps. i'm not on any contraceptives. what may be the cause?

Unclear: Your bady is likely reacting to the hormonal changes, cleaning up your diet may make a difference , the high toxic additive and inflammatory foods most people consume can cause many different issues-inflammatroy foods are dairy, grains and sugar-make sure to get healthy fats, healthy proteins and lots of green leafy vegetables at each meal -this kind of dietary change often is quite helpful some

Could be many: things, ovarian cysts, or endometriosis for example. See your doctor for exam/testing/treatment. This is not normal.