The last cough standing: The runny nose has passed, the fever has dropped, and the body has returned to routine, but the cough remains. It appears at night, after talking, when laughing, during exertion or when entering a cold room. Many people are frustrated and fear that something has "gone down to the lungs." Sometimes it really is an infection requiring treatment, but often it is irritated airways that continue to react even after the virus has left.
A cough is a protective reflex. It is designed to clear phlegm, particles, irritation or secretions from the respiratory tract. It can be dry or wet, short or prolonged, persistent or deep. After a viral illness, the mucous membranes of the nose, throat and bronchi remain sensitive. Even a small irritation, cold air, exertion or prolonged talking can trigger a cough. Such a cough may last several weeks and gradually improve.
Post-nasal drip is one of the common reasons for a persistent cough. Secretions from the nose and sinuses drip back into the throat, mainly when lying down, causing throat clearing, coughing, a sensation of phlegm or a need to clear the throat. This happens after a cold, in allergies, in sinusitis or in chronic congestion. Sometimes the person says they do not have a runny nose, but feels phlegm in the throat. Treatment for the nose, rather than the lungs, may solve the cough.
When a cough points to something else
Asthma can manifest as a cough alone. There is not always clear wheezing or attacks of shortness of breath. A cough that worsens at night, during exertion, in the cold, after laughing or during exposure to dust and allergens can suggest sensitivity in the respiratory tract. In children and adults, a recurring cough after viruses can be the first sign of asthma or an inflammatory response of the bronchi. In such cases, an appropriate inhaler may help, but only after a medical evaluation.
Reflux is another factor hiding behind a cough. Acid or stomach contents rising to the esophagus and throat can cause a dry cough, hoarseness, throat clearing, a sour taste or a sensation of a lump in the throat. Sometimes there is no classic heartburn. A cough that worsens when lying down, after a heavy meal, coffee, alcohol or late eating can point in that direction. Here too, cough syrup alone will not solve the cause.
Smoking, including electronic cigarettes and hookah, causes chronic irritation in the respiratory tract. A morning cough, permanent phlegm or a decline in fitness in smokers are not conditions to be accepted as normal. They can suggest chronic inflammation of the bronchi or obstructive lung disease. Quitting smoking is the most important treatment, but a prolonged cough in a smoker–especially with blood, weight loss or chest pain–requires investigation.
Medications can cause a cough, especially a specific group of blood pressure drugs. The cough is usually dry, stubborn and appears after starting the medication, sometimes even after weeks. Anyone who has started a new drug and suddenly suffers from an unexplained cough should update their doctor. One should not stop blood pressure treatment on their own, but replacement can be considered when there is a clear connection.
When a persistent cough needs attention
When is the cough more concerning? When there is a high or prolonged fever, shortness of breath, chest pain, blood in phlegm, unexplained weight loss, night sweats, severe weakness, significant wheezing, low oxygen saturation, a cough lasting more than 3 to 8 weeks depending on the context, or worsening after there was already improvement. People with lung disease, heart disease, immunosuppression, older age or young infants also need a lower threshold for examination.
A chest X-ray is not required for every post-viral cough. If the person is young and healthy, without warning signs, and the cough is gradually improving, imaging is sometimes unnecessary. But when there are red flags, an abnormal physical examination, suspicion of pneumonia, a very prolonged cough or risk factors, the doctor may recommend an X-ray, blood tests, lung function tests or further investigation.
And what about syrups? Some provide slight relief, some do not do much, and some are not suitable for young children or people with underlying conditions. Honey can ease a nighttime cough in children over one year old and in adults. Drinking fluids, moderate humidity, avoiding smoking and treating the underlying cause are more important than most remedies. Antibiotics are not a treatment for a viral cough, unless there is a suspicion of a bacterial infection.
A persistent cough can be a major nuisance, but it is also a clue. Sometimes it is the tail end of a virus. Sometimes it comes from the nose, the bronchi, the stomach, a medication or smoking. If it is improving, it can be monitored. If it persists, worsens or comes with warning signs, it is best to stop hushing it with syrup and check what it is trying to say.