Feeling always hot can be caused by various factors including medical conditions, lifestyle, and environmental influences. Common causes include hyperthyroidism (an overactive thyroid), stress or anxiety, menopause, pregnancy, diabetes, medication side effects, and environmental factors like heat and humidity. Some people also naturally have a higher body temperature or sweat more due to fitness levels or body composition. If the sensation is persistent and unexplained, it could indicate an underlying health issue worth discussing with a healthcare provider for appropriate diagnosis and treatment.