Recurrent or chronic fever is seen in tuberculosis, 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, fungal infections, lymphomas and other cancers etc. It can even be diabetes and hyperthyroidism.
In women, even polycystic ovary, menopause, PID (pelvic inflammatory disease) should be investigated for.