​Differential diagnosis of severe stiffness or catatonia

​Differential diagnosis of severe stiffness or catatonia: 
-meningitis 
-stiff person syndrome 
-lethal catatonia 
-strychnine poisoning 
-tetanus 
-Huntington’s disease
-dystonic reaction to neuroleptics such as torticollis 
-malignant hyperthermia 
-neuroleptic malignant syndrome 
-seizures 
-status epilepticus
-neuroleptic induced catatonia 
-CNS bleed
-viral encephalitis 
-Parkinson’s disease
-catatonic schizophrenia