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For individuals with chronic illnesses (underlying conditions) such as diabetes, heart disease, or COPD (Chronic Obstructive Pulmonary Disease), influenza is not just a common cold; it is an extremely dangerous threat that increases the risk of severe illness, hospitalization, and death by 5 to 10 times or more. Especially since a highly virulent Type A virus is predicted to circulate in the 2025 season, vaccination is positioned as an "essential medical procedure to save lives."While the prevention of illness for people with underlying conditions may be a moderate 30% to 50%, the influenza vaccine demonstrates overwhelming figures for the prevention of severe illness (80% to 95%) and prevention of hospitalization (70% to 90%). Scientific evidence clearly shows that the mortality risk increases by 60% to 80% if the shot is not administered.

The side effects that occur after an influenza vaccination, such as "sore arm," "fever," and "malaise," are essentially "proof that your immune system has properly awakened" and is preparing to fight the virus.The true nature of the side effect is the release of inflammatory substances called "cytokines" by immune cells (macrophages) that recognize the foreign material (vaccine antigen) in the body. If these cytokines cause local blood vessels to dilate, it leads to arm swelling; if they stimulate the brain's thermoregulatory center, it leads to fever. Fever is an "immune strategy" designed to activate the immune system and is by no means a sign of a weak body.