Hi,
Thanks for asking at HCM.
Brief :
Tuberculosis, Malignancy
Detailed Answer:
I have gone through your query and understand your concern, you should be worried but not too much.
Weight loss and persistent
low grade fever is usually associated with Tuberculosis, Malignancy, & Hyperthyroid status.
worms in intestines also can cause the same problem.
As you are 75 years old so possibility of malignancy and hyperthyroid status can not be ruled out.
I will suggest you to undergo a battery of tests like complete blood counts, widal test,
thyroid function tests,
lipid profile, complete urine, stool examination, CEA (carcino-embryonic antigen), and sugar profile, tests for tuberculosis like PCR-TB also.
i will also suggest you to fix an appointment with your family physician for general examination and necessity of any other test if needed.
After all these tests reports final diagnosis can be made and tretament can be started as per the diagnosis.
If yo have any more queries the feel free to ask, i will be glad to answer you.
Wish you good health.
Thanks & Regards
Dr. Shiv