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Thick blood may also be caused by the presence of harmful pathogens such as fungi, viruses, bacteria, and parasites. These pathogens can actually activate a coagulation response in the body as a way to avoid being attacked by the bodyâs immune system.
Food allergies are also known to cause excessive phlegm and certain types of food such as dairy products cause a thickening of mucous. Postnasal drip also commonly causes excess mucus at the back of your nose and throat many times after eating. Excessive, thick phlegm or chest mucus can often be caused by viral or bacterial infections such as influenza, bronchitis and pneumonia, as well as irritants such as those inhaled during smoking.