Body fluid is the fundamental component of blood and sweat. Traditional Chinese medicine (TCM) says that profuse sweating means the heart is using a lot of blood and Qi, which may result in palpitations and violent beatings of the heart. Too much sweating depletes Yin and injures Yang of the heart. Those who have a lack of Yin in the heart are likely to sweat at night. At the same time, sweating does not always indicate heart problems. In TCM no condition can be diagnosed from just one symptom.