Colds and flu are usually caused by the invasion of external evils and physical weakness. Cold and flu is a mild form of external infection caused by wind evil that offends the surface. The wind evil invades the body either through the mouth and nose, or through the skin and hair. Insufficient positive qi and weak guards will easily be affected by the evil and lead to recurring illnesses. Cold and flu is characterized by cold (fear of cold), fever, headache, soreness and pain in the limbs, nasal congestion, sneezing, clear flow of mucus, itchy pharynx, coughing, and white thin sputum. The disease can be treated with cold and flu granules, ginseng-su cold and flu tablets, strong cold and flu tablets and so on. If there is a need for medication, it is recommended to use it under the guidance of a professional physician, and not blindly self-medication.