Broken finger or thumb - NHS - Signs of a fractured thumb Like 78.71% | 914 votes Views: 553 1 Download Around the base of your thumb. limited or no ability to move your thumb. Categories: Safe Comments: Add Comment Cancel By Faegor - 22:14 Cold or numb feeling. By Dit - 10:10 Usually a broken thumb is actually a fracture of a bone within your hand. You should always seek medical treatment for a broken thumb. By Balkree - 05:10 In your thumb, several ligaments help you grab objects, pinch, and make a fist. A thumb sprain is much less serious than a broken thumb.