Abstract
Recently occupational hazards have become big social problems, many of which have been tended to be taken for personal problems though. And few studies have been made scientifically in this field. The study about harbor loading and unloading were made here. About 80% of labors who are more than 30 years old and more than 50% of labors under 30 have suffered from lumbago.
Before 10 years ago, the main cause of lumbago was heavy load, but today fork lift trucks are used. The vibration and the working posture and environment are its main factors.
