🔴
Go to Emergency Protocol
Severe reaction?
This isn't the tool for that.
Understanding Your Symptoms
Explore terminology, mechanics, and track your observations.
Allergy vs Sensitivity vs Intolerance
Allergy
An immune response that happens when your body's immune system reacts to a substance it has identified as a threat. Reactions are typically fast — minutes to a couple of hours after exposure.
Sensitivity
A reaction that doesn't follow the classic antibody pathway of an allergy, but still involves the immune system. Sensitivities often show up later — anywhere from hours to a couple of days after exposure — which can make the pattern harder to spot on your own.
Intolerance
A non‑immune reaction, usually linked to how your body processes a particular substance (for example, an enzyme it's short on). Timing varies depending on digestion.
These are general explanations to help you describe what you're experiencing more precisely — they're not a diagnosis. Only a doctor or allergist can confirm which of these applies to you.