I dreamt my thumbs were broken. They swelled up and hurt and I couldn’t decide which hospital to go to so wandered up and down a curving road until I woke up. Consulting dream dictionaries I find that this is highly ambiguous symbolism:
If you are suffering from a sore thumb, you will lose in business, and your companions will prove disagreeable. To dream that you have no thumb, implies destitution and loneliness. If it seems unnaturally small, you will enjoy pleasure for a time. If abnormally large, your success will be rapid and brilliant. (from the “thumb” entry in a 1901 dream guide)
On the other hand,
If you have an injured hand, some person will succeed to what you are striving most to obtain. (“hand“, 1901 dream guide)
I think I’ll go with the “abnormally large” (i.e. swollen interpretation, since it promises rapid and brilliant success. Though of course I knew what the dream was really about long before I looked up the dream dictionaries.