Was 2013 the year of Pharrell Williams? With chart toppers such as Blurred Lines and Get Lucky, this writing and producing veteran has suddenly become a rising star.
1 Take the Exercise and Fitness Quiz!  AMS (acute mountain sickness): Acute mountain sickness (AMS) is the effect on the body of being in a high altitude environment. AMS is common at high altitudes, that is above 8,000 feet (2,440 meters). Three-quarters of people have mild symptoms of AMS over 10,000 feet (3,048 meters).
1 MCAS-synonym: mast cell activation disorder (MCAD) - is characterised by the accumulation of genetically altered mast cells and/or abnormal release of mast cell mediators, affecting functions in potentially every organ system, particularly the skin, gastrointestinal tract, and cardiovascular and nervous systems. In systemic mastocytosis with associated haematological non-mast cell lineage disease (SM-AHNMD), the prognosis depends on the course of the associated haematological disorder. 2  Agressive systemic mastocytosis and mast cell leukaemia have a poorer prognosis.