A snap or cracking sound might be your first indication you've broken an arm. Signs and symptoms include:  Severe pain, which might increase with movement Swelling Bruising Deformity, such as a bent arm or wrist Inability to turn your arm from palm up to palm down or vice versa 
snap cracking sound first indication you've broken arm  signs symptoms include:  severe pain  increase movement swelling bruising deformity  bent arm wrist inability turn arm palm palm down vice versa 
broken arm