Go to the doctor and get an x ray to clarify you will generally get a cast for abOut a month,if you don't want to go to the doctor then. The symPtoms for a broken thumb are
Swelling
Pain
Discoloration
Mobility(sometimes you can still move thumb)
If you have 2or3 of these you can get a real cheep splint at a local pharmacy.
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You can not fix a broken thumb.if its broken you will have to get a fake one or something or you can live without a thumb.so if any one has a broken thumb live your life with pride.
You can fracture your thumb by smashing it too hard against an object or you can out of the blue just fall and get unlucky. Alot of times video game buttons can fracture your thumb, too.