<unk>  is a condition of inability or decreased ability to perform physical<unk>  at the normally expected level or duration for people of that age, size, sex, and muscle mass. It also includes experiences of unusually severe post-exercise pain, fatigue, nausea, vomiting or other negative effects.<unk>  is not a disease or syndrome in and of itself, but can result from various disorders. In most cases, the specific reason that<unk>  is not tolerated is of considerable significance when trying to isolate the cause down to a specific disease. Dysfunctions involving the pulmonary, cardiovascular or neuromuscular systems have been frequently found to be associated with<unk> , with behavioural causes also playing a part.
Exercise intolerance
Paroxysmal nocturnal dyspnoea
Heat intolerance
Alarm fatigue
Palpitations
Platypnea
Myxedema
Tachypnea