Hi Susan Welcome to HCM I have gone thru your query regarding chronic cough in an elderly person . I can understand your concern . In fact , in my point of view ,cough is a boon bestowed by mother nature to cleanse the pollutants off our airways There are many factors causing us cough acute or chronic -- Removing the cause will help eradicate the problem Viral infections we know as the common cold and flu. Allergies can also lead to a dry cough. Air pollutants can irritate the back of the throat causing a cough. intake of hot immidiatly after cold or cold after hot causes inflammation resulting sever cough . Acid reflux is also a cause of dry coughs. Removing the causes will help eradicate the problem . It can be caused by allergies, dry air, a random tickle at the back of your throat that won’t go away, the aftermath of a cold, being in a dusty environment, As your doctor ruled out any thing wrong in chest ,a few precautions may give you relief . Gargle with luke warm Salt water sooth your throat . A spoon of Honey and fresh ginger juice or 2 piece fresh crushed garlic is very soothing for tickling and irritating of throat . A balanced diet including vitamins minerals and antioxidants in natural form guarantee overall good health . Avoiding fatty , fast foods , alcohol , too hot or too cold foods sleeplessness,worry , anxiety ,hydration , all help you get relief from cough Pranayam - Deep breathing - Inhale - HOLD - Exhale -Hold 10-15 times is helpful in strengthening your throat , lungs , chest and gives resistance from problems . and induces good sleep Neck rotation exercises also help in getting relief . Hope this helps solve your query Take care . All the best