Hello there
Dequervain is a very common problem...its not a problem of thumb the tendons at the base of the thumb near the wrist gets swollen.
I have seen many cases of it....since how many days are you having this problem....n till now what medications have you taken.
Do get back with answers.
Regards
Next Steps
Dr.Raviraj Francis
MPTh(Rehab),MPT(MSk).UK