What causes coughing after recovering from a positive to negative COVID-19 infection?
Apr 19, 2023
Source: Cainiu Health
Dr. Guo Xiheng
Introduction
After recovering from a positive COVID-19 infection and turning negative, coughing mainly occurs because the respiratory tract has been damaged by the virus. Specifically, when the airway mucosal epithelium is injured, nerves underneath the mucosa become exposed and highly sensitive to external stimuli; thus, activities such as talking, exposure to cold, or inhaling unpleasant odors may trigger coughing. It remains essential to continue wearing masks properly, washing hands frequently, enhancing hand hygiene, and maintaining social distancing.
After recovering from a positive to negative transition following a COVID-19 infection, coughing mainly occurs because the airways have been damaged by the virus. Specifically, when the epithelial lining of the respiratory mucosa is injured, the underlying nerves become exposed and highly sensitive to external stimuli. This can trigger coughing in response to talking, cold exposure, or inhaling unpleasant odors.
Following a COVID-19 infection, particularly with variants such as Omicron that primarily affect the upper respiratory tract, the virus replicates extensively within the airways, leading to destruction of mucosal cells. At the same time, immune cells gather in the area to eliminate the virus. After completing their function, these immune cells naturally die off through metabolic processes. Together with the virus-damaged cells, they become biological waste. Since the airways cannot accommodate such debris, the body produces mucus to form phlegm, which is then expelled through coughing.
If symptoms persist for a prolonged period after infection, with recurring illness and repeated inflammatory stimulation of the throat mucosa causing chronic cough, medications such as Lianhua Qingwen Capsules or Jizhi Syrup may be used under medical guidance. Additionally, if one lives in an environment with polluted air, dust particles may irritate the throat and provoke coughing. Maintaining fresh indoor air and avoiding polluted environments typically helps alleviate cough symptoms. Moreover, individuals who are allergic to substances like pollen or animal dander may experience allergic reactions upon exposure, resulting in coughing. In such cases, antihistamines such as Loratadine tablets or Cetirizine Hydrochloride tablets may be taken under a doctor's supervision.
Because the body tends to be weakened during a SARS-CoV-2 infection, it is important to consume adequate nutrition after turning negative to enhance immunity. Patients are advised to eat high-protein foods such as lean meat, eggs, and milk, which help replenish nutrients and support recovery. Even after testing negative, individuals should continue wearing masks, practicing frequent handwashing, maintaining good hand hygiene, observing social distancing, and avoiding crowded gatherings as much as possible.
