splinter, broken, dislocated(it can happen, i have made it happen), infected
There are several disorders that cause severe pain in the interphalangeal area of the thumb joint without there being a traumatic injury to it. Arthritis is one of the top disorders that causes this.
If you smashed your thumb in the car door, you can help get rid of the bruise and the pain by icing the thumb and taking ibuprofen or acetaminophen.
Keeping your finger in cold water will reduce pain.
I'm guessing you mean inside the hand and I had that when my nerves were inflamed. Go see a doctor.
Pinched nerve in shoulder or c-spine
To alleviate piano thumb pain while playing, try adjusting your hand position to reduce strain on the thumb, take breaks to rest and stretch your hands, and consider using a thumb brace or support to provide extra comfort and stability.
I've heard that the pressure point located between your thumb and pointer is associated with the muscles in your shoulders and upper back. It could be that the pain between your thumb and finger is indicative of tension in your upper back. A good backrub couldn't hurt anyway.
To cure pains in the thumb,First keep the thumb in one position,(try not to move it so much).Gently,apply ice to the thumb to prevent swelling,Then take two Motrin or pain relievers.(try to soak the thumb in warm water. If pain still occurs something is wrong and you need to go to the EMR quickly !
To prevent pain and injury in your guitar thumb while playing for long periods of time, make sure to maintain proper hand and thumb positioning, take breaks to rest your thumb, stretch your hand and thumb muscles regularly, and use proper technique to avoid straining your thumb. Additionally, consider using a thumb pick or fingerpicking style to reduce pressure on your thumb.
Inflammation causes pain on movement.
I think any pain in ”any hand” causes pain in both hands.
When you play guitar, the repetitive motion and pressure on your thumb can cause strain and inflammation in the muscles and tendons, leading to pain. It is important to take breaks, stretch, and use proper technique to prevent thumb pain while playing guitar.