 It is often misdiagnosed as polycythemia, polycythemia vera, hyperviscosity syndrome, or sepsis.Most SCLS patients report having flu-like symptoms (like a runny nose), or else gastro-intestinal disorders (diarrhea or vomiting), or a general weakness or pain in their limbs, but others get no particular or consistent warning signs ahead of their episodes.They subsequently develop thirst and lightheadedness and the following conditions measurable in a hospital emergency-room setting