Some common causes include:
Postnasal drip: When you lie down, mucus from the nose and sinuses can drip down the back of your throat, leading to irritation and triggering a cough.
Gastroesophageal reflux disease (GERD): GERD is a condition where stomach acid flows back into the esophagus, causing irritation and sometimes reaching the throat, leading to a cough, especially when lying down.
Asthma: Asthma can cause increased sensitivity and narrowing of the airways, and lying down may exacerbate these symptoms, leading to a cough.
Allergies: If you are allergic to dust mites, pet dander, or other allergens in your sleeping environment, lying down can trigger a cough as you come into contact with these allergens.
Chronic bronchitis: Inflammation of the bronchial tubes can cause a persistent cough, which may worsen at night.
Heart-related issues: Sometimes, heart-related issues, such as heart failure, can lead to a cough that worsens when lying down due to fluid accumulation in the lungs.
Since it has been five months and the problem persists, it's essential to consult a healthcare professional for a proper evaluation. Your doctor can take a detailed medical history, conduct a physical examination, and possibly order additional tests to identify the underlying cause of your nighttime cough.
Keep track of any other symptoms you may experience, such as shortness of breath, chest pain, or wheezing, and share this information with your doctor. They will be in the best position to diagnose the cause of your cough and recommend appropriate treatment. Early diagnosis and management are essential to prevent any potential complications and improve your quality of life.