Sometimes, adenomyosis causes no signs or symptoms or only mild discomfort. However, adenomyosis can cause: 
Heavy or prolonged menstrual bleeding
Severe cramping or sharp, knifelike pelvic pain during menstruation (dysmenorrhea)
Chronic pelvic pain
Painful intercourse (dyspareunia)
 Your uterus might get bigger. Although you might not know if your uterus is bigger, you may notice tenderness or pressure in your lower abdomen.