Clinically, if the menstruation is delayed within 5 days than the previous menstruation is a normal phenomenon, if it is more than 5 days in the clinic may be due to the following reasons: the first one is due to pregnancy caused by the phenomenon of menopause; the second one is clinically caused by endocrine disorders, often due to the recent stress, nervousness, anxiety, insomnia, or changes in the environment or suffered from the cold stimulation, or often drink frozen drinks may lead to the phenomenon of delayed menstruation. The reason for this is that the menstruation may be delayed due to stress, anxiety, insomnia, environmental changes, cold stimuli, or frequent drinking of ice-cold drinks. It is recommended to pay attention to this in your daily life, keep an optimistic mindset, and try not to drink ice-cold beverages. Female menstruation is a normal physiological phenomenon, in the clinical cycle is regular, the amount of menstruation is normal, the color of menstruation is dark red, and the time of menstruation usually 3-7 days will be clean, these are normal phenomena.