What are the reasons for menstruation occurring half a month early?

Patient's question:

Around the 27th, my period arrived. On the 13th of this month, during lunch, I felt like my period was coming. After dinner, when I went back to the office, I noticed blood on my underwear. In the afternoon, after going home, when I cleaned my private area in the bathroom, there was blood. Then I put on a sanitary pad, and after that, there was no more bleeding. That night, I felt weak in my legs and a bit of pain in my stomach. Currently, I am in my ovulation period.
Treatment and Effect in May:
I have not yet gone to the hospital for a check-up. I am afraid my family will find out! I don’t know what the disease is. I’m afraid it might be something serious.
What kind of help I need:
I hope you can explain it in more detail and tell me what the cause is. If possible, could you also tell me what medicine I can buy to treat it? Thank you.

Doctor's answer:

1. Weight loss can cause a woman's menstrual cycle to advance. Fat is a crucial condition for female maturation and serves as the energy source for menstruation and fertility. If the total body fat of a woman is less than 17% of her weight, it can affect the development of sexual organs and the onset of menstruation. Research also indicates that if a woman consumes too little fat over time, estrogen secretion in her body may decrease, potentially leading to delayed menstruation or even amenorrhea.
2. Constipation can cause a woman's menstrual cycle to advance. Constipation is also one of the main culprits behind menstrual irregularities in women. When the rectum is excessively filled with feces, the cervix is pushed forward, while the uterus tilts backward. If this posterior uterine tilt occurs repeatedly over a long period, the veins within the broad ligament may be compressed and obstructed, leading to congestion in the uterine wall and a loss of elasticity. If the uterus remains in a posterior position for an extended time, it can cause lower back pain and menstrual disorders.

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