Yin deficiency may manifest as dry mouth and thirst, internal heat and night sweating, dizziness and tinnitus, and weakness of the waist and knees. Yin deficiency gives birth to internal heat, which is manifested as five heart-heat (heat in the hearts of the hands and feet, and self-consciousness of the heart and chest), night sweating (sweating abnormally after going to sleep, and sweating stops after waking up), dry mouth and thirst, and accompanied by yellow urine. In addition to the above symptoms of yin deficiency, yin deficiency in different organs will have different manifestations. Kidney yin deficiency manifests as dizziness and tinnitus, lumbar and knee weakness (a feeling of soreness and weakness in the waist and knees), etc.; in case of lung yin deficiency, it is often accompanied by a dry cough; patients with heart yin deficiency manifest insomnia and heartburn. Yin deficiency patients should not eat spicy food, such as chili peppers, white wine, to avoid aggravating the condition, and eat more fresh fruits and vegetables to help restore health. If you have symptoms, you should take medication under the guidance of a professional physician, do not take medication blindly, in order to avoid delays or adverse reactions.