Oral Curcumin for the Treatment of Pain of Thumb Base Joint (CMC) Arthritis

The goal of this clinical trial is to learn about the use of turmeric (Curcumin) as a treatment for pain of thumb-joint arthritis. Turmeric is commonly being used as an over-the-counter treatment for musculoskeletal pain. Clinical trials have demonstrated a pain-relief benefit for knee osteoarthritis, however no clinical trial has been performed to establish efficacy of curcumin in humans for thumb-joint arthritis. The main question\[s\] it aims to answer are: * Is Turmeric more effective than placebo at relieving pain for thumb-joint arthritis? A placebo is a look-alike substance that contains no active drug. * Is Turmeric more effective than placebo at improving patient-reported outcomes for CMC arthritis? * Is Turmeric safe for participants with thumb-joint arthritis? Participants will: * take 4 weeks of daily Turmeric capsules, * take 4 weeks of daily placebo capsules * answer daily surveys about how they are feeling and functioning.