What causes persistent stomach growling esp. when lying down. i do ab workout. i have done deworming 100 times.

Stomach noise: This has nothing to do with "worms" so you can stop that effort. The stomach is a muscular bag that mixes ingested foods with stomach acid to prepare it for later digestion. The churning action involves moving around ingested air that produces sounds. It can occur whether you have eaten or not. If this natural process bothers you a diet change may alter the pattern. It is not an abnormal event.