Contents: Overview of Heat Injury. -- Classical Heat Stroke: Overview. -- Exertional Heat Illness: Epidemiology and Prevention. -- Physiology and Pathophysiology of Heat Injury Diagnosis of Heat Injury. -- Practical Management in Classical Heat Stroke. -- Neurological Complications in Heat Stroke. -- Cardiovascular Complications in Heat Illness. -- Infectious Complications in Heat Stroke. -- Hematologic Problems in Heat Stroke -- Hematological Manifestations in Heat Stroke -- Gastrointestinal Complications in Heat Stroke. -- Heat Stroke: Renal Perspective. -- Management of Heat Stroke in Intensive Care Unit -- Endocrine Abnormalities in Heat Stroke. -- Pathology in Heat Stroke Patients. -- Heat Stroke in Children -- Rehabilitation for Heat Stroke Patients. -- Patient Information of Heat Stroke. -- Recommendation for Management of Heat Injury in The Royal Thai Army Medical Department.