Sweating on the forehead is a common occurrence. This is because of the excessive sweat glands in the forehead area and the sympathetic excitement caused by various reasons, resulting in excessive sweating on the forehead. Some patients have excessive forehead sweating due to mental stress or psychological stress, obesity, hot weather or sports activities, which is physiological in nature. And some patients suffer from excessive forehead sweating due to some chronic diseases such as diabetes, hyperthyroidism, heart failure and cancer.