Why do I get a fever blister before big events?

The timing is not bad luck - it is the virus picking its moment. A fever blister (cold sore) is the herpes simplex virus, which most people pick up in childhood through close skin contact like kissing, per the NHS, and which then lives quietly in the body for life. Most of the time your immune system keeps it dormant. The NHS lists the known wake-up triggers: illness, sunshine, and being on your period - the common thread being an immune system or skin barrier under pressure. Big events replicate that pressure: the late nights and run-down feeling beforehand mimic mild illness, weddings and holidays add sun exposure, and stress hormones take their own toll on immune surveillance. The virus senses the dip and heads for the lip. MedlinePlus notes most carriers get outbreaks several times a year, becoming less frequent over time. The single most useful skill is catching the prodrome: the NHS describes the start as a tingling, itching, or burning feeling, with blisters following over the next 48 hours. Antiviral cream applied at the tingle - not once the blister is established - shortens the episode, and for frequent or badly timed outbreaks a GP can prescribe antiviral tablets. During an outbreak, remember it is contagious: no kissing, no sharing lip balm or towels, and wash hands after touching it. Prevention for the calendar-conscious: defend sleep in the week before a big event, use lip sunscreen outdoors, and keep antiviral cream in the bathroom cabinet so the tingle never catches you unprepared. Pymander is a free AI doctor, 24/7 by text, that can help you plan around a big date.