<s>[INST] Hi there, I am having a throbbing pain in my thumb and I don t recall smashing it with anything. It s almost like I feel my heartbeat in my thumb and it feels hot and sore. I ve had this before but I usually just wait it out a while. The nail is not black, basically appears normal. Any suggestions to relieve pain and what is it exactly? [/INST] Hello, I think it is a thumb extensor tendonitis which is an inflammation from may be overused (profession or cell phone texting too much). If the pain goes to the forearm might be De Certain steno sing tendonitis. The initial treatment is anti-inflammatory Chat Doctor.  If not better the second stage is cortisone injection around the tendon sheath. If not better the third stage of treatment is surgery, but this is rare. Hope I have answered your query. Let me know if I can assist you further. </s>