pain in left side lower abdominal, my periods are normal and I never took contraceptives

Hi All, i am 30 years old lady, i am recently one year married.

  anybody suggest me about my health issues, I am slightly having pain in left side lower abdomen, not every time but ya sometimes cramping occur. my periods are normal and never took any contraceptive pills.this pain sometimes disturb me.

What can be the cause and treatment.