First, read the English article below.

Learn what symptoms are normal for women to experience during and just before their periods start. The following symptoms are experienced by many women during their menstrual cycle:  Irritability Mood swings Minor headaches Stomach aches Cramping in stomach, legs, or back Changes in appetite Cravings for particular tastes or foods Acne outbreaks Tender breasts Feeling tired or sleepy Back or shoulder pains Every woman's cycle is unique. Record the symptoms you experience before and during each period to help you predict an upcoming period. Recognize the warning symptoms that frequently precede your period. Write down the symptom(s) you experience and their severity on each day. Irregular periods can be a symptom of many conditions that need medical attention. Some of the most common medical problems that cause irregular periods include:  Pelvic organ problems like imperforate hymen or polycystic ovary syndrome  Irritable bowel syndrome Liver disease Diabetes Eating disorders like anorexia and bulimia Obesity Tuberculosis If your period is irregular, you should see your doctor. Make sure you find a doctor you are comfortable talking to, as this can feel like a sensitive subject for some. Sometimes, there may be an underlying health issue causing irregularity; other times, irregular periods can be regulated with lifestyle changes such as weight loss or changing your type of birth control. 

Now, please write a short abstract for it in Vietnamese. Abstract:
Nhận biết các dấu hiệu. Nhận biết những dấu hiệu của riêng bạn. Đến bác sĩ khám nếu kinh nguyệt không đều. Điều hòa chu kỳ kinh nguyệt.