Uncontrolled pain
Electrolytes imbalance (hypokalemia, hypomagnesaemia)
Missed medications (beta blockers, calcium channel blockers)
Hypoxia (pulmonary embolism; obstructive sleep apnea, atelectasis)
Hypotension
Infection (sepsis, pneumonia)
Severe anemia
Hypovolemia, dehydration
Worsening heart failure/cardiac ischemia
Withdrawal (alcohol, benzodiazepines, cocaine)
Hypothermia
Thyroid disease (hyperthyroidism)
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