This is the same reason women who are pregnant also suffer from leg cramps and abdominal pain because of the excess weight they now carry.
Insufficient minerals and vitamins
Calcium, potassium and magnesium are important minerals that help the body to function properly. A deficiency in minerals may lead to muscle pain.
A common cause of pain in women is endometriosis. It occurs when the tissue in the lining of the uterus are found outside the uterus in places such as the fallopian tubes, ovaries and pelvic regions.
What do they feel like
Period cramps occur in lower position than your tummy around your pelvic region. They can be mild or severe. Severe cramping may signify that you have a more serious health problem especially if it is accompanied by bleeding or spotting.
Implantation cramps occurs in early pregnancy and ovulation cramps are other forms of discomforts experienced by women in their lower abdominal area.