Common products such as paint, insulation, rigid foam, Particle Board, plywood, duct liners, exhaust fumes and other chemical contaminants from indoor or outdoor sources, and biological contaminants can be trapped inside by the HVAC AC system. As this air is recycled using fan coils the overall oxygenation ratio drops and becomes harmful. When combined with other stress factors such as traffic noise, poor lighting, inhabitants of buildings located in a polluted urban area can quickly become ill as their immune system is overwhelmed. Certain VOCs, considered toxic chemical contaminants to humans, are used as adhesives in all common building construction products. These aromatic carbon rings / VOCs can cause acute and chronic health effects on the occupants of a building, including cancer, paralysis, lung failure, and others. Bacterial spores, fungal spores, mold spores, pollen, and viruses are types of biological contaminants and can all cause allergic reactions or illness described as SBS. In addition, pollution from outdoors, such as motor vehicle exhaust, can infiltrate into poorly designed buildings and contribute to poor indoor air quality, high ppm of CO and CO2. Adult SBS symptoms were associated with a history of allergic rhinitis, eczema and asthma.A 2015 study concerning the association of SBS and indoor air pollutants in office buildings in Iran found that, as carbon dioxide levels increase in a building, symptoms like nausea, headaches, nasal irritation, dyspnea, and throat dryness have also been shown to increase. Certain work conditions have been found to be correlated with specific symptoms.
The sound of air moving around the lumen of the stomach is amplified by the empty space. Around two hours after the stomach has been emptied, it sends signals to the brain, which tells the digestive muscles to restart peristalsis in a wave called the migrating motor complex. Food left behind after the first cycle is swept up, and the vibrations of the empty stomach cause hunger. Appetite plays a big role in this situation. Peristalsis recurs about every hour, and ones appetite may cause 10- to 20-minute food cravings. Stomach rumbles can form further along the gastrointestinal system when air is swallowed while talking, eating, and drinking. This phenomenon occurs in most people and is typical. Diseases and conditions
Celiac disease is a condition that prevents the small intestine from absorbing parts of food that are needed to stay healthy. Consuming food containing gluten is dangerous for people with this disease: Intestinal villi help to absorb nutrients from food, but when gluten is consumed, the immune system attacks these villi as a result. Symptoms may include abdominal pain, nausea, and bulky or foul smelling stools. Colitis is swelling of the large intestine. The many different forms of colitis include cytomegalovirus or Cryptosporidium infection, and necrotizing and pseudomembranous colitis. The usual causes of colitis are infection and lack of blood flow. Symptoms may include bloody stools, chills, dehydration, diarrhea, and fever. Diverticulitis is a condition where small bulging sacs, usually found in the large intestine, become inflamed or infected.