Infection (e.g., gas gangrene) can cause gas to be trapped in the subcutaneous tissues. Subcutaneous emphysema can be caused by medical procedures and medical conditions that cause the pressure in the alveoli of the lung to be higher than that in the tissues outside of them.
So here's a quick look at PFE's most important numbers right now (for April 14, 2017). PFE shares slipped 0.12% or $0.04 from the previous trading session. That took the Pfizer stock price to $33.88.
Most blue-chip members of the index ended up in the green, with DuPont (NYSE:DD) among today's better gainers as the stock jumped 0.9%. Meanwhile, Pfizer (NYSE:PFE) fell to the bottom of the Dow today, with the big pharma stock dropping 0.6% in the wake of its failed attempt to acquire AstraZeneca.