Are there any ways to start losing feeling in your hand if you have an untreated wrist fracture?

Swelling from wrist: Injury can cause nerve compression particularly in the carpal tunnel in addition the radial sensory nerve and many sensory nerves are prone to injury or compression against the splint or cast . Untreated fractures may swell more and thus may lead to nerve compression more easily . Also just having swollen skin makes the skin feel different. But one must be very careful it's a fracture accompanied by swelling also has a loss because there could be so much swelling that circulation is compromised to the best thing for fracture is to get treated.

Losing Feeling: Anytime someone has numbness or tingling, it should be evaluated. This should not be considered a normal part of aging or, in your case, an injury. A wrist fracture (broken bone) can cause pressure on a nearby nerve leading to loss of feeling and muscle weakness. You would definitely benefit from a visit to a hand surgeon, a doctor that specializes in hands and wrists, both bones and nerves.