A stiff neck without other symptoms is often caused by minor muscle strain from sleeping in an odd position or looking down at a phone too long. This usually gets better with home care.
But a stiff neck that happens after an injury (like a fall) or along with a fever and headache could be more serious. For example, meningitis is a infection of the covering of the brain and spinal cord that can cause a stiff neck, headache, and fever.
How Is a Stiff Neck Treated?
If your child has a stiff or sore neck but wasn't injured and has no fever or other symptoms:
Put a warm moist cloth on the neck for 20 minutes every 3–4 hours as needed for pain.