1. Respiratory tract infection, mostly from virus which is the same group causing flu and influenza
2. Bacterial infection such as Bordateria pertussis, Mycoplasma pneumoniae, Chlamydia pneumoniae, Streptococcus pneumoniae, Haemophilus influenzae
3. Irritants such as smoking, air pollution, dust, chemical agent, etc.
4. Irritation from gastric enzyme in patient with gastroesophageal reflux disease (GERD)

1. Slight fever, chills, fatigue
2. Cough with few or no sputum initially then increasing much more secretion later
3. In case of sticky green or yellow sputum is caused by bacteria infection

Medicines according to complaints such as fever medicines, cough medicines and mucolytics or phlegm thinners, and bronchodilators.

• Enough rest, 
• Avoid smoking, old weather, get a flu shot