Signs and symptoms vary depending on severity and location of injury
Most often present unilateral
Onset may be acute or subacute
Minor - electric shock, burning sensation shooting down the arm, numbness/weakness in arm
Severe - weakness/paralysis, numbness, severe pain
C5 injury:
weakness of deltoid and infraspinatus causes adducted, internally rotated shoulder
C6 injury:
weakness of biceps causes elbow extension
C7 injury:
weakness of extensor muscles causes wrist and digit flexion
weakness of deltoid and infraspinatus causes adducted, internally rotated shoulder
weakness of biceps causes elbow extension
weakness of extensor muscles causes wrist and digit flexion
Rucksack paralysis
Parsonage-Turner syndrome
Tick paralysis
Toxic neuropathy
Meralgia paresthetica
Progressive neuropathy secondary to exposure 
Horner syndrome
See weakness, numbness