Just cruising through here for the first time...sounds like it could be an ovarian cyst (if you are a woman of course!) especially if it is lower. There are so many benign cysts and normal cysts that are called "functional cysts" and come and go with your cycle. But, you need to go to a doctor to just make sure it's normal, not likely to rupture. I had a ruptured cyst at 24 years old and had to have emergency surgery.
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