Although it is not the norm, some women do experience pain during ovulation. Eggs are released into the Fallopian tube and this may cause a certain degree of pain in some cases.
Cramping is a common symptom during ovulation and is nothing to be alarmed about - it happens because your body is expelling unneeded material. This is perfectly normal.
Some women do experience from cramping. It is secondary to the hormonal changes taking place in the body at this time. It is due to normal physical processes rather than a disease.