Welcome to HCM.
Most likely your wife is suffering from tropical eosinophilia
Best test to diagnose is Total and differential count of WBC and if the eosinophil count
is more than 5% then she is likely to be suffering from Tropical eoosinophilia. Consult a doctor and he will advise proper treatment.
For joint pains
blood uric acid has to be checked. If it is high then Gout
has to be considered and high uric acid level needs to be treated.