What causes internal over heating in the body?

Internal overheating in the body can be caused by various factors, including intense physical activity, dehydration, and certain medical conditions like fever or hyperthyroidism. Environmental factors, such as high temperatures and humidity, can also contribute. Additionally, some medications and dietary choices may affect the body's ability to regulate temperature. When the body's heat production exceeds its heat dissipation, overheating occurs, potentially leading to heat-related illnesses.