Oral contraceptives are definitely harmful to the body, such as the short-acting contraceptives commonly used in clinical practice, which may cause water and sodium retention, cause weight gain, and cause discoloration on the face. Most commonly, it causes endocrine disruption, irregular menstruation, incomplete menstruation or reduced menstrual flow or even amenorrhea. Emergency contraceptive pills are clinically more harmful because they prevent ovulation and break the ovaries’ natural ovulation pattern, which may cause endocrine disorders, menstrual disorders, changes in menstrual flow or irregular vaginal bleeding.