The main reasons for having cramps without a period include ovulation (the release of an egg mid-cycle), early pregnancy, ruptured ovarian cysts, stress, hormonal imbalances, and some medical conditions such as endometriosis, uterine fibroids, pelvic inflammatory disease, urinary tract infections, and inflammatory bowel disease. Ovulation cramps often occur around days 10-14 of the cycle and can cause pain on one side of the lower abdomen. Early pregnancy can cause cramping as the uterus adjusts, even before a missed period. Medical conditions like endometriosis involve tissue similar to the uterine lining growing outside the uterus, causing pain and cramps without bleeding. Other issues like gastrointestinal problems or infections can also mimic menstrual cramps. If cramps are persistent, severe, or accompanied by other symptoms like abnormal bleeding, fever, or unusual discharge, it is advisable to consult a healthcare professional for evaluation and diagnosis.