First time passing big blood clots the size of golf ball. Is that normal?

While many women do pass large clumps of menstrual lining, it helps to know your age and whether you are on BC or other medications, have been pregnant, could have just been pregnant, etc.

I am having blood clots the size of tennis balls come out of me every twenty minutes or so. I feel it before it cones and I have to push it out. I am going through 3 pad every hour./