Low immunity, the body is in a state of sub-health, mainly manifested by the weakening of the body systems. There are several manifestations as follows: 1. the self will feel that the efficiency in study and work is continuously reduced, the daily state of mind is long, concentration is not good, easily fatigued, and the temper becomes bad. 2. the defense of the respiratory system is weakened, easy to catch cold and flu, the cold cycle becomes frequent, usually one does not pay attention to easily catch a cold, or when the people around you catch a cold, you are also easily infected, and each time The duration of each cold becomes very long, and the treatment is not easy or incurable, and there are always unpleasant symptoms left behind that are difficult to heal. 3. When the skin of the body is injured or ulcerated, it is easily infected with redness, inflammation and pus, and the wound does not heal easily, and the skin becomes sensitive and prone to allergy. 4. The urinary system is easily attacked by bacteria, especially women are prone to urinary tract infections, urinary urgency, painful urination, frequent urination and other uncomfortable symptoms.