Educational Disclaimer: This chapter is part of the “101 – Learn Homeopathy” course on monkmodehealth and is intended for general knowledge only. Nothing written here constitutes medical advice, diagnosis, or treatment. Do not use this as a substitute for professional medical care. Always consult a qualified practitioner for health concerns. What you do with this knowledge is your personal choice and responsibility.

101 – Learn Homeopathy · Chapter 51 of 100

Allium Cepa

The Remedy for Watery Colds With Streaming Eyes

Source

Allium cepa (common onion)

Common potency

30C for acute use

Primary action

Watery colds and hay fever with streaming, irritating discharge

Forms available

Pellets, liquid dilutions

What Is Allium Cepa?

Allium Cepa, prepared from the common onion — chosen because cutting a raw onion reliably produces exactly the symptoms this remedy addresses — is one of the most recognizable and easy-to-understand remedies in the entire homeopathic Materia Medica, based directly on the Law of Similars (Chapter 13).

The Three Keynotes You Must Know

Keynote 1: Burning, irritating nasal discharge with bland, non-irritating tears

The defining Allium Cepa pattern, mirroring the experience of chopping an onion, is a nasal discharge that burns and irritates the upper lip, paired with tears that are notably bland and non-irritating to the skin — the reverse pattern from Euphrasia (Chapter 52).

Keynote 2: Frequent, violent sneezing

Allium Cepa colds and hay fever typically feature frequent, sometimes violent sneezing fits, alongside the streaming nasal discharge.

Keynote 3: Symptoms better in open, cool air and worse in a warm room

Unlike many cold remedies, Allium Cepa symptoms characteristically improve in cool, open air and worsen in a warm, stuffy room.

When to Reach for Allium Cepa

Colds with copious, burning, irritating nasal discharge that reddens the upper lip
Hay fever with streaming eyes and nose, alongside frequent sneezing
Symptoms that improve in cool, open air and worsen indoors in a warm room
A raw, irritated sensation under the nose from frequent wiping
Sneezing fits triggered by entering a warm room from outside
A headache accompanying profuse nasal discharge, easing once discharge slows

Allium Cepa Versus Euphrasia: Which Discharge Burns?

This is one of the most useful comparisons in the entire course for distinguishing similar-looking colds: Allium Cepa has burning nasal discharge with bland tears, while Euphrasia (Chapter 52) has the exact opposite pattern — burning, irritating tears with a bland, non-irritating nasal discharge. This single distinction is often enough to choose correctly between them.

Potency and Dosage

Situation	Suggested potency	Frequency
Acute watery cold or hay fever	30C	Every few hours during the acute phase, especially during sneezing fits
Seasonal allergy flare-up	30C	As needed during high-pollen periods
Symptoms lasting beyond 10 days or with facial pain/fever	—	Seek medical evaluation for possible sinus infection

A Real-World Scenario

Consider someone in the throes of hay fever season, sneezing repeatedly with a nose that streams so much it leaves the skin under the nostrils red and raw, while their eyes water freely without any burning or irritation, and who finds some relief the moment they step outside into cooler air. This burning-nose, bland-eyes, cool-air-relief pattern is a classic prompt to consider Allium Cepa.

⚠ What Allium Cepa Will Not Do

Allium Cepa is not a substitute for medical evaluation of sinus symptoms that become severe, are accompanied by facial pain and fever, or persist well beyond the typical course of a cold or allergy flare.

Up next — Chapter 52

Euphrasia — The Remedy for Burning, Streaming Eyes

Read Chapter 52 →

Why This Belongs in Every Home

Given how common both colds and seasonal allergies are, and how easy the onion-based pattern is to remember, Allium Cepa is one of the most practical and memorable remedies for household use.