Chest tightness after taking Chinese medicine for a period of time may be caused by improper use of medication, or it may be caused by cardiac neurosis, asthma and other diseases. 1. Improper use of medication: If the patient does not follow the doctor’s instructions to use the medication on time, according to the dose, or the drug is not symptomatic, then it is easy to chest tightness after a period of time after taking traditional Chinese medicine. 2. Cardiac neurosis: the cause of this disease is not clear, it may be induced with factors such as heredity, character traits, excessive worry, sentimentality, excessive life pressure and so on. If the patient is overly nervous about whether the disease can be cured during the period of taking traditional Chinese medicine, it is easy to induce cardiac neurosis, followed by chest tightness, palpitations, dyspnea and other symptoms. 3. Asthma: the occurrence of this disease is the result of the combination of genetic and environmental factors, such as pollen, food, animal dander, smoking, excessive exercise and so on. Therefore, if patients are exposed to the above allergens or have behaviors that trigger the disease during the medication period, the therapeutic effect of the medication will be affected, which can be manifested as chest tightness, shortness of breath, wheezing and so on after taking Chinese medicine for a period of time. There are many reasons for chest tightness after taking Chinese medicine for a period of time, so it is necessary to go to the hospital for consultation to clarify the specific reasons and carry out targeted treatment.