According to Everyday Health, period cramps cause mild to severe lower abdominal pain and aches that are intense, causing a female to be uncomfortable. However, some females even experience nausea, vomiting or diarrhea.
Everyday Health claims that period cramps are caused by the uterus contracting in order to shed the uterine lining. Period cramps can start shortly before a female experiences her period, and the cramps typically subside within a day or two after the period starts. Everyday Health also claims that the intensity of period cramps peak 24 hours after a period begins, but some women will feel cramps throughout their entire period. There are times where women will feel excruciating pain in the lower abdomen and there are times where women will not experience painful periods at all.