Reaction formation may be a temporary coping mechanism, but it’s unproductive in the long run. It ignores underlying beliefs or challenges that need to be addressed, which can hurt mental health.

Allergies are an immune system reaction to substances called allergens. The cause a range of symptoms from a stuffy nose to itchy eyes to difficulty breathing. How long allergies last varies based on ...

Reactions to a recent immunization (vaccine) Most are reactions at the shot site (such as pain, swelling, redness) General reactions (such as a fever or being fussy) may also occur ...