How many days is a normal menstrual cycle?

Patient's question:

No

Doctor's answer:

Generally, a delay or advancement of seven days in menstruation is considered normal. Factors such as environmental changes, emotional fluctuations, and stress from study or work can all cause a delayed menstrual cycle. Some organic disorders may also lead to menstrual delays. It is recommended to relax, closely monitor your condition, and seek timely medical examination if any discomfort occurs.