<s>[INST] ok i was infected with pinworms (?) for many many years and know one believed me so it was left untreated until i was 18 and found treatment on my own. i was just wondering if this could be the cause of the abdominal pain/loose frequent stools/stomach and back pain that i know have almost constantly?? [/INST] Hi thank you for choosing HCM.Yes pinworms can cause abdominal pain and loose stools.Best method is to send stool sample for worms and eggs and start treatment with Albendazole as per doctor's guidance.Regards. </s>