It could be down to several factors including parasites so yes. IMO it's not a Q if you have some parasites. It's what type of parasite you have. Also if you can't find something. It don't mean it's not there. I'm not trying to scare but parasites are extremely good at hiding. Don't get me started about the uneducated medical community when it comes down to such issues. Most of the ppl end up treating themselves after being looked down by the medical community as 'crazy ppl'. Pinworms are very common and usually easily treatable. It's their bigger roundworm brothers you need to worry about such as ascaris. I suggest starting with mebendazole (very safe). But if you believe that the parasites gone systemic you better try albendazole (before taking this please access the risk). I don't really advocate herbs.