There are various possible causes of side pain. It also depends on whether the pain is on the right or left side. Find out ...

History of Present Illness: A man in his mid-40s presents to the emergency department (ED) for evaluation of palpitations and a 2-day history of left flank pain associated with urinary frequency.

“This can appear as serious localized pain in your right or left side,” says Dr. Finkelston. “A pregnancy test should be part of the workup to rule this out,” she adds.

Ovulation pain (mittelschmerz): Mid-cycle pain during ovulation, often on one side. Menstrual cramps: Commonly experienced during menstruation and can radiate to the lower abdomen.

Feeling pain under your left breast can be especially worrying. After all, important organs and structures sit on that side of the body, like your heart, left lung, stomach, spleen, oesophagus ...