When i do activities that involve thumb use(such as video games or texting) the bottom of my thumbs start hurting bad, rather quick. why can this be?

Overuse problems : Your thumbs did not evolve to do hours of the activities you describe. The set up of the muscles and ligaments in our fingers never envisioned hours of the types of use gaming and texting gives. Once you start to have overuse symptoms, they are very hard to settle down. You may have to do without these activities for WEEKS for the pain to resolve and stay away. .....Good luck!

Overuse: What you describe is the overuse of your thumbs. The bottom of your thumb is where your thumb meets the main part of your hand. You are having inflammation in the joint between the bones of your thumb and the bones of your hand.if you keep this up you will develop arthritis in that area from overuse. You need to give your thumb and the rest of your fingers a rest.