What happens to periods with an intrauterine device or system (IUD/IUS)?

What happens to periods with an intrauterine device or system (IUD/IUS)?

All types of IUD can make periods irregular, especially in the first few months.
 
Periods become lighter and may sometimes stop completely with the hormonal IUDs, making them a good choice for women with heavy or painful periods.
 
Copper IUDs may make periods heavier initially, but this usually improves after a few months.