<unk>  can be a sign or symptom of several disorders.
Meningism is the triad of nuchal rigidity, photophobia (intolerance of bright light) and headache. It is a sign of irritation of the meninges, such as seen in meningitis, subarachnoid hemorrhages and various other diseases. "Meningismus" is the term used when the above listed symptoms are present without actual infection or inflammation; usually it is seen in concordance with other acute illnesses in the pediatric population. 
A stiff neck can also be a sign of a musculoskeletal disorder or muscle spasm.
Neck stiffness
Neck pain
Neck masses
Ear pain  
Ear pain
Leg swelling
Abdominal enlargement
Cool extremities