ibuprofen can cause gastritis and stomach ulcers but i would really have no way of knowing if this is the cause of your boyfriend's symptoms. he would be wise to see a medical provider so he can be properly examined diagnosed and treated.
my boyfriend takes ibuprofen every day. he lost his appetite has nausea & a bad stomachache could it be an ulcer? . i do not think he has a stomach virus because he has not thrown up. also i have been exposed to him (i live with him) and i am immune deficient but have not gotten ill.