Breakthrough Bleeding
Regular exercise can cause subtle changes in your hormone levels, which can interfere with the cyclic buildup and shedding of your uterine lining. The lining of your uterus may respond to these mixed hormonal signals by randomly shedding, which causes breakthrough bleeding.
Can heavy exercise cause early periods?
Intense exercise can cause irregular periods or cause your period to stop altogether. Often, this condition is associated with athletes who train for several hours daily. It's most common in sports with weight constraints, like ballet and gymnastics.
Can exercise cause periods twice a month?
Rapid weight gain or loss and excessive amounts of exercise can also affect the hormones that stimulate ovulation, changing the typical pattern of your cycle.