Ms. Liu had a bad cold 2 months ago and after treatment, her cold symptoms improved significantly, but she kept coughing. She often had an unbearable itchy throat, choked on frying fumes in the air conditioner, and even talking would cause a cough. The cough was even worse when she was lying in bed, which seriously affected her sleep. She ran to many hospitals, took chest X-ray, etc. Some physicians diagnosed chronic pharyngitis, and some diagnosed bronchitis, and also drip, and eat antibiotics and cough medicine, is not getting better. In fact, what Ms. Liu had was a “post-cold cough”. These patients usually do not find any abnormalities in chest X-ray and blood tests, but mostly show an itchy throat, an irritating dry cough or a small amount of white mucus sputum. Some patients have a light cough during the day, but the cough worsens at night when they lie down; some cough until they become nauseous and vomit; some develop chest pain to the point that they are afraid to breathe deeply; some middle-aged and elderly women also experience urinary incontinence when they cough, which is very painful. This symptom usually lasts for three to eight weeks or even longer. Lin Jincai prescribed medicine for Ms. Liu and advised her not to drink alcohol or eat spicy foods while taking the medicine to avoid constant irritation of the throat. The rate of misdiagnosis and mismanagement of patients with “post-cold cough” is quite high. These patients are often diagnosed with “chronic pharyngitis”, “chronic bronchitis” or “bronchiectasis”. Many people have misconceptions about coughs, thinking that they must be bacterial infections. In fact, although coughing after a cold is caused by respiratory tract infection, bacterial infection does not occur in most patients after acute symptoms of cold such as headache, fever, generalized aches and pains, sneezing, nasal congestion, runny nose and sore throat disappear. The desperate consumption of anti-inflammatory drugs and antibiotics by patients with this type of cough not only does not help to treat the cough, but also causes the abuse of antibiotics and side effects such as dysbiosis in the body. An effective way to prevent “post-cold cough” is not to take heavy medication at the beginning of the cold, to eat lightly during the cold, not to drink or smoke, and especially not to stay up late.