I hurt my wrist, now its swollen, painful from my fingers to my elbow and cracks when I move it. Something serious?

Maybe. Any joint that stays swollen a few days after an injury should be x-rayed to rule out a serious injury.
Injury. Persistent swelling and main is definitely concerning. Could have a fracture (broken bone) or a ligament injury. Depending on where the pain is, a nerve could be involved. Get checked out by an orthopaedic surgeon and/or hand surgeon.

Related Questions

I hurt my wrist, now its swollen, painful from my fingers to my elbow and cracks when I move it. Something serious?

Need evaluation. From what you described, it sounds like you may have sustained a fracture or injury to one of the ligaments in the wrist. You should be evaluated by a specialist with x-rays and a good physical exam. An MRI may also be necessary.
Yes. You must have this checked and x-rays. Sounds like a serious fracture.
Seek medical care!!! Lack of treatment could result in nerve, tendon, muscle or bone injury with permanent consequences such as pain, numbness, deformity, weakness, loss of function. Don't delay.
Maybe. What was the injury? If pain and swelling around a joint for more than a couple of days I would get an x-ray to rule out a fracture. If pain is intense then see a doc sooner rather than later.