During a heart attack, patients often experience profuse sweating as their parasympathetic nervous system activates. This is a branch of the autonomous nervous system that prepares the body to run or defend itself from aggression. The organism is perceiving a source of danger, and it’s activating this parasympathetic nervous system to increase the function of the heart and overcome the blockage in the normal blood flow.
The parasympathetic branch of the nervous system activates various body functions, including the secretion of sweat glands in the skin. That is why people become sweaty when they are nervous or during a heart attack.
Night sweats can be a symptom of a heart condition, especially in women, but it is more commonly caused by menopause and other hormonal alterations. You should ask your doctor if your night sweats become excessive and profuse, such as constantly waking up in the middle of the night soaked in your own sweat.