Left side of my stomach twitch. happen 3 to 4 times. what could be the cause?

Abdomen twitching: If you are thin, you may be seeing/feeling the movement of your intestines under the skin. The large intestine crosses the abdomen just under the stomach and then descends down the left side of the abdomen to its exit. Or if it is more on the surface, that is probably a muscle twitch/spasm. The whole abdomen is covered by a layer of muscle (the 6-pack muscles). If no pain/no diarrhea - no worries.