 [ Symptoms ] severe constant abdnominal pain yellow mucous blood in stool loss of appetite passing stool causes painful cramps  3 weeks ago i had a very severe stomach ache next day i have severe cramping and stool consisted of mucus and blood with a fever i was prescribed the antibiotic amoxicillin stool contained large amounts of yellow mucous and blood abdominal pain is more severe during bowel movements and mucus and blood still appear i am an 18 year old female i recently started a diet in december where i now eat only healthy foods exercise 30 minutes 3 times a week what could possibly be going on with me [ Disease ] you need to schedule an appointment with a gi immediately could be some kind of stomach ulcer