Hi.. Welcome to healthcare magic.. According to your complain you have problem of string stool if this problem more than one week and with abdominal symptoms than you have to diagnoses a condition.... Low fiber and lack of water intake in diet cause string stool. Constipation also cause string stool problem.. Intestinal parasite infection cause this string like stool.. Consult a gastroenterologist for further diagnosis... Stool examination test is helpful for further diagnosis.... I hope my guidance helpful to you... Take care.. Thank you..