
What Causes Low Grade Fever Every Evening?

ivnestigation is required
Detailed Answer:
Hello,
a prolonged (?) low grade fever is difficult to investigate if no symptoms or signs can lead the diagnostic thought to a certain direction. If his doctor could not detect any clinical signs during clinical examination then some basic tests have to be done to search for hints.
Basic blood tests include: ESR, CRP, complete blood count, urea, creatinine, liver function tests, urinalysis. If no useful finding occurs then radiological tests might be required. You can start with lower cost tests like a simple chest X-ray and an ultrasound scan of the abdomen and continue with tests like CT-scan of the abdomen (and/or the chest).
Other possibly useful tests include endoscopy of the upper and lower gastrointestinal system.
Depending on the results, other tests might be required. You should understand that this kind of symptom is too vague and the doctor has to take one step at a time. The findings may change the strategy of investigation.
I hope you find my comments helpful!
You can contact me again, if you'd like any clarification or further information, or if you'd like to provide more details (like test reports, etc).
Kind Regards!

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