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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.
1 Chronic obstructive pulmonary disease (COPD) is a common cause of a thickâ¦. 2  Diagnosing Excessive Mucus in the Chest Chest mucus is the result of many acute and chronic medical conditions. 3  To effectively diagnose the etiology of chest mucus, diagnostic imaging tests and blood tests are ofteâ¦.