Endometrial thickening is not necessarily cancerous. Clinically, it can be caused by inflammation of the endometrium, which thickens the endometrium, often accompanied by lower abdominal pain or dysmenorrhea. It may also be caused by polycystic ovary syndrome, as patients with polycystic ovary syndrome may experience sporadic menstruation or even amenorrhea if no intervention is made, which can cause the endometrium to thicken under the stimulation of estrogen. If hormonal drugs are taken, this may also lead to thickening of the endometrium, and in the case of obesity, this may also lead to thickening of the endometrium. For endometrial thickening, the appropriate tests should be done as soon as possible, the main one being diagnostic scraping, which is done at the 6th-12th hour of menstruation, to send the scraped out tissue for pathological examination, so that a final diagnosis can be made and treatment can be given.