My guess is over indulgence ..with the sun of course !!! On a serious note ..ask a local to get you some "tuna" . It is a plant that you mash and drink .. they will know what you are looking for .. the stuff is sort of nasty to drink ..but worked wonders for me and my banged up hockey body ..trust me I was most skeptical ..but damn .. I was back to 100 % in a couple of hours ..amazing !!