I found this information from Harvard Health:
- That nagging cough https://www.health.harvard.edu/staying-healthy/that-nagging-cough
"Dozens of conditions can cause a recurrent, lingering cough, but the lion's share are caused by just five: postnasal drip, asthma, gastroesophageal reflux disease (GERD), chronic bronchitis, and treatment with ACE inhibitors, used for high blood pressure."

@robtlhughes, coughing can be part of pulmonary fibrosis or maybe it's related to GERD. On this page, you'll find some tips to calm the cough from the Lung Association related to IPF https://www.lung.ca/lung-health/lung-disease/ipf/living-ipf), such as:
- Quit smoking. Stay away from secondhand smoke.
- Avoid irritants. Are there things in your environment (home, work, or play) that are causing the cough?
- Relaxation and breathing control.
- Check to see if something else is causing the cough, for example, postnasal drip, acid reflux (heartburn).
- Find if there is a medication you take that as causing the cough, for example a blood pressure medication.

@jsmtgal, do you also have pulmonary fibrosis? Or are you trying to find answers about a persistent cough?