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: * hemoconcentration (elevated hematocrit or hemoglobin readings, with hematocrit levels >49% in men and >43% in women, not because of an absolute increase in them but because of the<unk>  of plasma); * very low blood pressure (profound arterial hypotension, with systolic blood pressure levels <90 mm Hg); * albumin deficiency (hypoalbuminemia measuring <3.0 g/dL); * partial or generalized edema, and cold extremities; * a paraprotein in the blood (an MGUS in approximately 80% of cases).
Capillary leak syndrome
Sepsis
Pulmonary-renal syndrome
Polycythemia vera
Edwards syndrome
Polycythemia
Thoracic insufficiency syndrome
Hyperviscosity syndrome