Sweating at three or four o’clock in the evening is mostly caused by yin deficiency and fire (deficiency of yin and essence in the body, and hyperactivity of deficiency and fire). The main clinical manifestations of yin deficiency fire is hot flashes (a burst of heat), night fever, or five heart heat (two hearts and two feet heart heat, and consciously heart and chest heat (irritability and sultriness) and so on. Yin deficiency fire, also known as yin deficiency fire is mostly due to great injury to yin fluid, yin deficiency and hyperactivity of yang (deficiency of yin fluid and hyperactivity of yang), and internal generation of deficiency fire (insufficiency of yin fluid in the body leading to the generation of fire and heat evil). Yin deficiency and internal heat are mostly seen as generalized signs of deficiency heat. Such as facial warmth, emaciation, night sweating (abnormal sweating after going to sleep and stopping sweating after waking up), red tongue with little moss, thin pulse (pulse becomes narrower and thinner and the rate is accelerated), weakness, etc. If you have a fever at three or four o’clock in the evening, you will be able to feel the heat in your body. If the symptoms of dryness and sweating continue to worsen at three or four o’clock in the evening, you should go to the hospital in time to avoid delaying your condition.