Symptoms of serious illness
        
        
          
            Immediate medical care may be needed if a headache, vomiting, fever, or a seizure occurs along with another serious illness. Symptoms of a serious illness include:
            
              - Severe neck stiffness or pain.
 
              - Confusion or extreme irritability.
 
              - Extreme sleepiness.
 
              - Persistent nausea or vomiting.
 
              - Severe sensitivity to light (photophobia).
 
              - Unsteadiness that prevents standing or walking (ataxia or vertigo).
 
              - New double vision, blurred vision, or blind spots.
 
              - Very rapid, difficult breathing.
 
              - Severe pain.
 
              - New and different skin rash or severe bruises.
 
              - New swelling, pain, redness, or warmth in one or more joints.
 
            
           
         
        
          
            
              Current as of: October 24, 2024