The most typical clinical presentation of amenorrhea is the absence of menstruation and cessation of menstrual periods. There are many causes of amenorrhea, such as exposure to cold, fatigue, medications, diseases, bacterial infections, and poor emotional states, all of which can lead to hormonal imbalances and result in amenorrhea. Additionally, amenorrhea may occur after sustained physical activity, which is related to the individual's psychological state, stress response level, and a decline in physical condition. If there is a weight loss of 10%-15%, or a 30% decrease in physical condition, amenorrhea may occur. If amenorrhea occurs, dietary adjustments can be made, such as avoiding picky and partial eating, avoiding intense exercise, and consciously increasing the intake of high-protein, high-calorie foods. This is beneficial for the production and transformation of hormones and maintaining normal menstruation. If symptoms do not improve, medical attention should be sought promptly.