Are there viruses which cause chest/lung pain and coughing up green? how many days until i should consider dr. visit/ chest xray?

Absolutely. : Many viruses do this. Coughing up green stuff is not a good indicator of whether its bacterial or viral illness. Most viral respiratory illness gets better on their own over 5-10 days. If you have fever>3 days, shortness of breath, or risk factors for badness (smoking, diabetes, asthma, copd), then you should see your doctor.

Chest Lung Pain: Most acute respiratory infections start with a viral infection or an irritant, such as tobacco or reflux of stomach acid into the lungs. Green mucus just means mucus has been plugged for more than a few days. Use and expectorant, such as guaifensin, to help break up the mucus. Drink plenty of fluids. Any shortness of breath, or have cough that lasts longer than seven days, see a doctor.

Yes: Viral infections can change the color of the mucus and can cause chest pain. Usually viral infections will peak by day 5 of an infection. If symptoms are not getting better by that time or if coughing is to the point where sleep is effected then a doctors visit may well be indicated. If a bronchodilator is not helping then it may also make sense to contact your physician.

Viral bronchitis...: Viral bronchitis can produce these symptoms and it typically runs its course over a few days to week. If your symptoms are worsening, you should see your doctor. If you smoke, you need to quit today to decrease airway inflammation.