Hello Thank you for trusting HCM Dear chronic diarrhoea with fever causes are mentioned below but history is need to come to a conclusion. Have you suffering from abdomen pain? What is color and consistency of stools? Is it diarrhoea recurrent or continuous? Are you alcoholic or smoker??? Any other habits?? Dear common possibilities are some infections like salmonella and shigella can cause problems, some drug resistance e-coli may cause this effect. You mentioned evening raise of temperature and loose stools possibly abdominal tb involving intestines,other immunocompromised conditions and lymphoma a may cause your symptoms. Dear consult your doctor and get it done stool culture, blood investigations, and usg abdomen he will treat you accordingly. Till that time you can use Use Rifaximine 200 mg thrice a day, Enterogermina twice a day, tab. Loperamide twice a day.