If it happens only occasionally, don't worry, it may be just a little menstruation, such as eating too much before going to bed, not keeping up with nutrition, and not fully relaxing after fitness. . . . . If this happens for a long time, you should consider adjusting your diet and plan. Is nutrition not keeping up? It may also be that the amount is too large and the body consumes too much. Suggestion: 1, keep up with nutrition; 2. Rest for two weeks.