Reactions don’t all look the same, and the single most important skill in this course is telling a mild reaction from a severe one. Anaphylaxis is a sudden, severe allergic reaction, and early recognition and treatment matter because reactions can progress quickly.
Lesson 2.1
When reactions may occur
Reactions frequently begin soon after exposure, but the timing can vary — symptoms may start subtly and then progress. Don’t wait for every possible symptom to appear before acting, and let the individual emergency plan direct treatment. There’s no universal timeline that fits everyone.
Lesson 2.2
Skin and mouth symptoms
Early or milder symptoms often show on the skin and around the mouth: hives, redness, itching, swelling of the lips, face, or tongue, or tingling and itching inside the mouth. These can be the whole reaction — or the opening act of something bigger. Crucially, a serious reaction can occur without visible hives, so their absence never rules out anaphylaxis.
Lesson 2.3
Breathing and throat symptoms
Act now — these are red flags
Difficulty breathing · wheezing · repeated coughing · throat tightness · trouble swallowing · a hoarse voice · noisy breathing · a sensation that the throat is closing.
Any of these points to a severe reaction. Follow the emergency plan and treat without delay.
Lesson 2.4
Stomach, heart, and neurological symptoms
Reactions reach well beyond the skin. Watch for repetitive vomiting, severe abdominal pain, or diarrhea; dizziness, weakness, or confusion; a pale or bluish appearance; fainting or collapse; and a sudden feeling that something is seriously wrong. These systemic signs are serious and, combined with others, point to anaphylaxis.
Lesson 2.5
Mild symptoms versus anaphylaxis
The distinction that guides your response: a single mild symptom (one itchy spot) is different from severe breathing or cardiovascular symptoms, from symptoms affecting multiple body systems, and from a reaction that is rapidly worsening. Any of those last three is treated as anaphylaxis.
Your plan beats any chart
This page teaches recognition, but you must follow the person's physician-signed emergency plan rather than relying solely on a generic website chart.
Lesson 2.6
Recognizing reactions in children
Younger children rarely say “I’m having an allergic reaction.” They say things like “my mouth feels funny,” “my tongue is hot,” “there’s something stuck in my throat,” “my tummy hurts,” “I feel scared,” or “I don’t feel right.” Watch, too, for sudden crying or unusual quietness, scratching at the tongue, drooling, refusing food, or other behavioral changes — young children often can’t describe what’s happening. There’s more on this in peanut allergy symptoms in adults, which contrasts how adults and kids present.
🧩 Symptom Sorter
Match each symptom to the body system it affects, then check your answers.
- Hives and redness
- Wheezing and repeated coughing
- Tingling, itchy tongue
- Repetitive vomiting
- Dizziness and fainting
Scenario practice
1. One itchy spot on the arm, no other symptoms.
One body system, a single mild symptom. Watch closely, because reactions can progress — but this alone is not anaphylaxis. Follow the person's plan, which may advise monitoring and an antihistamine for isolated mild skin symptoms, and be ready to escalate.
2. Throat tightness after eating a cookie.
Throat tightness is a breathing/airway red flag — treat as anaphylaxis. Follow the emergency plan, give epinephrine if indicated, and call emergency services. Don't wait for more symptoms.
3. Hives followed by repetitive vomiting.
Two body systems involved (skin + stomach) — that meets the definition of anaphylaxis. Follow the plan, give epinephrine if indicated, and call for emergency help.
For each scenario, always ask: What symptoms are present? How many body systems are involved? What does the emergency plan say? Where is the epinephrine?
📄 One-Page Reaction Recognition Chart
| Mild (watch & follow plan) | Severe — anaphylaxis (act now) |
|---|---|
| A few hives, mild itching, runny nose, one itchy spot, mild mouth tingling | Trouble breathing, throat tightness, wheeze, repeated vomiting, dizziness, collapse, pale/bluish, 2+ body systems |
| My plan's specific instructions: | |
| Where my epinephrine is kept: | |
Check your understanding
Answer all 5 questions to complete this module.