Alcoholism

Anorexia

Cardiac disease

Cystic fibrosis

Dehydration

Diabetes insipidus

Eating disorders

Extremes of age

Febrile illness

Gastroenteritis

History of heatstroke

Hypokalemia

Obesity

Poor acclimatization

Sleep deprivation

Sunburn

Sweat gland dysfunction

Uncontrolled diabetes

Uncontrolled hypertension/thyroid disorder

Upper respiratory tract infection