Recurrent or chronic fever is seen in typhoid, tuberculosis, hepatitis, SLE, rheumatoid arthritis, Polyarteritis nodosa (PAN) and other auto immune disorders, UTI, drug
fever, sinusitis, glandular
fever, otitis media, IBS, HIV, STDs,
endocarditis, parasitic infestations (like malaria), fungal infections, lymphomas and other cancers etc. It can even be diabetes and hyperthyroidism.