Based on the location of the pain, and descriptive features it may be related to a tendinitis
, specifically called DeQuervain's tendinitis, an inflammation of the tendon that lines up with the thum. An easy manuever to confirm is to put your thumb towards your palm, then closing that palm making a fist and then moving the wrist medially (towards the midline); a sharp, exacerbation of the pain at the base or along the thumb line is very specific.
If so, then ice compresses, a wrist guard and anti-inflammatories can be prescribed by a physician.
Dr Brenes-Salazar MD
Mayo Clinic MN