Hello,
Yes, this is a viral infection. Most viral infections start with a general body discomfort, loss in taste, loss of appetite, body ache, joint aches, maybe pain in the long bones. Then fever occurs which can spike quite high - the decrease in your husband's case is probably due to the Advil he has taken.
It is not related to lifting heavy weights.
Please consult your doctor for an examination, blood tests and treatment.
I hope this helps.
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Experienced in the management of Pregnancy,Infertility,Menopause and all problems in Pregnancy and Gynecology