Uterine fibroids and adenomyosis are two completely different diseases, their causes, clinical symptoms and treatment methods are different. 1. Causes: Uterine fibroids are benign tumors of uterine smooth muscle caused by heredity, sex hormone level, stem cell dysfunction, etc. Adenomyosis is the invasion of endometrial glands and mesenchymal stroma into the uterine myometrium caused by various reasons. 2. Clinical symptoms: most fibroids do not have clinical symptoms, but a few patients will have increased menstrual flow and prolonged menstrual period; adenomyosis can also cause increased menstrual flow and prolonged menstrual period, as well as progressive worsening of menstrual cramps, and even radiate to the pubic area, anus or thighs. 3. Treatment: Many fibroids are asymptomatic and generally do not require treatment. Some fibroids will shrink or recede with the decrease of hormone levels, and surgical treatment is usually the mainstay for symptomatic ones. Adenomyosis, if more serious, also requires surgical removal. However, adenomyosis has no clear boundary with the surrounding muscle layer and is more difficult to operate on compared to fibroids. It is not possible to distinguish whether it is fibroid or adenomyosis by symptoms, it is recommended to go to the hospital for a detailed examination, and the doctor will make the judgment, and the appropriate treatment should be chosen according to the specific cause.