Prior to the introduction of the Global Industry Classification Standard (GICSÂ®) in 1999, Standard & Poorâs used a classification system with 11 sectors and 115 industries, similar to the Standard Industry Classification (SIC), which was introduced in 1937.
Symptoms: Mood-change, lethargy,irritability,confusion,fatigue and memory problems and myself chest pain this past 5 months, could the gas be the problem? Doctor : Thank you for your question. Natural gas or propane inhalation for extended periods of time can lead to headaches, nause a, shortness of breath, dizziness, and altered mental status. It is quite likely that this exposure could be eliciting your symptoms.
Bloating and gas build-up can occur after eating foods that are high in fiber, or can be a symptom of irritable bowel... Methane Gas Poisoning Symptoms. ... The methane gas had built up and went unnoticed due to lack of any other health complaints....