Histamine Symptom Questionnaire
Rate each symptom based on how often and severely it occurs in the past 3–6 months.
0 = Never / No symptoms
1 = Rarely (once a month or less)
2 = Occasionally (several times a month)
3 = Frequently (several times a week)
4 = Very often (daily or almost daily)
5 = Severe / Very intense (disabling or significantly impacts daily life
Add up your points, a score over 60 means probable histamine intolerance
Gastrointestinal Symptoms (most common and often most severe in HIT)
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- Abdominal bloating / distension 1 2 3 4 5
- Postprandial fullness (feeling overly full after eating) 1 2 3 4 5
- Diarrhea or loose stools 1 2 3 4 5
- Constipation 1 2 3 4 5
- Abdominal pain / cramps 1 2 3 4 5
- Nausea 1 2 3 4 5
- Flatulence / excessive gas 1 2 3 4 5
- Heartburn or acid reflux 1 2 3 4 5
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Cardiovascular / Autonomic Symptoms
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- Heart palpitations / irregular heartbeat 1 2 3 4 5
- Low blood pressure / dizziness upon standing 1 2 3 4 5
- Flushing (sudden redness, especially face/neck) 1 2 3 4 5
- Headaches (including migraines) 1 2 3 4 5
- Dizziness / lightheadedness 1 2 3 4 5
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Respiratory / Nasal Symptoms
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- Nasal congestion / runny nose 1 2 3 4 5
- Sneezing 1 2 3 4 5
- Difficulty breathing / shortness of breath 1 2 3 4 5
- Asthma-like symptoms or wheezing 1 2 3 4 5
Skin Symptoms
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- Itching / pruritus 1 2 3 4 5
- Hives / urticaria 1 2 3 4 5
- Rash or redness 1 2 3 4 5
- Swelling (e.g., lips, eyes, or angioedema-like) 1 2 3 4 5
Neurological / Psychological Symptoms
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- Brain fog / difficulty concentrating 1 2 3 4 5
- Fatigue / exhaustion that sleep does not help 1 2 3 4 5
- Anxiety, irritability, or panic attacks 1 2 3 4 5
- Sleep disturbances 1 2 3 4 5
- Vertigo or tinnitus 1 2 3 4 5
- Muscle twitching (e.g., eyelids) or tremors 1 2 3 4 5
Other / Miscellaneous Symptoms
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- Menstrual irregularities or worsened PMS symptoms 1 2 3 4 5
- Joint or muscle pain 1 2 3 4 5
- Sensitivity to temperature changes, smells, or chemicals 1 2 3 4 5
- Here is a downloadable version of this test: https://i.postimg.cc/GhvLZ7tG/Histamine_Questionnaire.jpg