Well ..you need to have food on time...Yes the common causes would be acidity, muscle spasm   or anxiety .do not wait till hunger pangs.maintain proper time.  Divide your meal time to small proportions so that you dont over eat..secondly drink lots of water. ..atleast 8-10 glasses per day . thirdly.. You need to stroll for a min of 15 min after each meal...stress,tension,all these are also factors of acidity...avoid outside food,junk and oily food...better to have gone cooked food for few days