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After getting the influenza vaccine, have you ever been told by a nurse or doctor, "Please take only a shower today and wait 6 hours before taking a bath"? Although many hospitals now say, "You can go right away," this "6-hour post-vaccination waiting rule" stubbornly persisted as a long-standing custom in Japan.

After receiving the influenza vaccine, many people feel uncertain and have questions about daily life: "Should I avoid exercise today?" "Is it okay to take a bath?" "Can I drink alcohol?" In particular, the outdated information that "bathing is prohibited for 6 hours after vaccination" still persists, leading people to unnecessarily restrict their daily activities.However, based on the latest clinical knowledge in 2025, the conclusion is very simple: "If you adhere only to the 30-minute waiting rule, you can resume 100% of your normal life starting on the day of vaccination."

"My child developed a runny nose and a mild fever (37.2∘C) on the day of the appointment. Should I cancel?" — This is one of the most frequently asked questions every flu vaccination season. Many people hesitate, fearing that "side effects will be worse if vaccinated with cold symptoms" or "the vaccine will be ineffective because the immune system is weakened by illness."However, the latest scientific and clinical data in 2025 completely overturn this common concern.

When you or your child have symptoms like a runny nose, a light cough, or a slight fever—what we call "a slight cold"—on your appointment day, do you hesitate about whether to cancel the vaccination? Many people miss their chance due to anxiety like, "Will the side effects get worse?" or "What if the fever goes up?"This article puts an end to this long-standing question. It thoroughly explains the real criteria used in medical practice in 2025 to determine "Can be vaccinated / Postpone," based on symptoms and body temperature.

"I have an allergy, so I can't get it." "I get a fever every year, so I'm scared." — Many people who hesitate to get the influenza vaccine mistakenly believe they are "contraindicated" (people who cannot get the shot). However, this judgment of "cannot be vaccinated" is changing year by year due to medical advancements.

Don't give up on vaccination due to misunderstandings! An M.D. reveals the latest criteria for Egg Allergies, Pregnancy, and Ongoing Medical Treatment."Should I get vaccinated this year?" "Can I even get the shot?"—Every year, the influenza vaccine season brings questions and anxieties. Especially for those with egg allergies, those who are pregnant, or those undergoing treatment for chronic conditions like asthma, many instinctively hesitate, thinking, "Is it safer not to get it?"But is that judgment truly correct?As of 2025, due to medical advancements and the latest findings, the consensus is that 99.99% of Japanese people can receive the influenza vaccine, excluding only those who have had anaphylaxis to the vaccine in the past or those with a high fever on the day of vaccination. This article provides a definitive list based on the latest views from the Ministry of Health, Labour and Welfare and medical specialists, ending all your doubts by listing those who absolutely cannot be vaccinated, those who should be vaccinated, and the "common misconceptions."