For women, the regular monthly arrival of their period has become a part of their daily life. Even so, there are still many women who do not know what kind of period is normal, so today we will introduce it to you. How long is the interval between periods considered normal? Usually, the menstrual interval is 28 days, and a range between 21-35 days is considered normal. Exceeding this is an abnormal phenomenon and requires a search for the cause. In adolescents, it is common for the menstrual axis to be between 21-45 days because it is not yet mature. How long is a normal menstrual cycle? Usually, the menstrual cycle is between 3-5 days, but 2-7 days is normal. Menstrual cycles longer than 7 days are a common problem and usually indicate a disease, so it is important to find out if there is a lesion in the uterus or a functional problem with the ovaries. Is dysmenorrhea considered normal? Under normal circumstances, there should be no pain. If there is dysmenorrhea, it may indicate an abnormality. In medical terms, one type of dysmenorrhea is called “primary dysmenorrhea”, which means that you have dysmenorrhea when you first have your period, and the other type is “secondary dysmenorrhea”. To distinguish between the two, recall whether it hurts when you have your first period or not, and you can probably tell the difference. In the case of primary dysmenorrhea, a systematic physical examination often does not reveal the presence of organic lesions that cause dysmenorrhea, and in the absence of organic lesions, symptomatic treatment is often recommended, and pain medication such as Fenbuterol can be used to control the symptoms. In secondary dysmenorrhea, there is often a pathology of the internal organs, so it is necessary to go to the hospital for examination to find out if there is an underlying disease. Is it normal to have a blood clot? The presence of blood clots in the menstrual cycle indicates excessive menstrual flow and needs to be investigated for the presence of organic pathology of the uterus. At what age is it abnormal not to have a period? If menstruation occurs earlier than 9 years old or later than 15 years old, or if there is no menstruation for 3 years after breast development, it is an abnormality and needs to be checked in the hospital. At what age is menopause abnormal? Menopause is defined as the absence of menstruation for more than one year. The average age of menopause in China is 49 years old. usually, irregular menstruation may occur 1-2 years before menopause, and this time is also called entering the perimenopausal period. menopause is abnormal before the age of 40, and if menopause occurs before the age of 40, it is called premature ovarian failure. The age at which menopause is abnormal is usually no more than 55 years old. Vaginal bleeding after menopause is an abnormal phenomenon, even if it is a drop of bleeding, it is a sign of abnormality in the body and requires vigilance.