My father is having fever but it doesn't seems like viral or flu . In month of may he had fever for continuous 10 days ranging between 98.8 to 99.6 . Now the nature of fever is same . It's fluctuating between 98.8 to 99.4 . Goes up and down , Decreases without paracetamol also and increase by itself. He has some issue in throat like always feels rigid in throat and disturbance . We have doubt that it could have any connection . Fever makes him weak and tired , and repeating fever is very disturbing we can't understand the reason . Today is day 3 of fever . Need some suggestion!