Hello! Thank you for the query. The most common reason of such symptoms is diet change or lifestyle change. Bowels are very sensitive for any diet changes as well as stress, long travel or even sleeping hours. Some bacterial changes in the intestine are the next probable reason. Please note that bowels are covered with intestinal bacteria which protect intestines. When there is not enough of this bacteria, pathological bacteria appear causing bowels problems. This is more possible if you have been using some antibiotics recently. I suggest you to start with diet improvement. Increase fiber rich products and mineral water intake. Start probiotic supplementation. If this wont help, stool tests should be next. If no infection will be present, blood work, liver tests, pancreas tests and abdominal ultrasound should be next. Hope this will help. Regards.