The side effects of Houttuynia cordata

Jun 25, 2025 Source: Cainiu Health

Dr. Sun Lianqing

Introduction

Common side effects of Houttuynia cordata include: it may easily irritate the gastrointestinal tract, causing discomfort such as abdominal pain and diarrhea; some individuals may experience allergic reactions; residual components in the mouth after consumption can easily cause bad breath; its components may damage the kidneys and affect their function; excessive consumption may also lead to poisoning, with symptoms such as nausea and convulsions. Dosage should be controlled during use, follow medical advice, and seek medical attention promptly if any discomfort occurs.

As a commonly used traditional Chinese herb, Houttuynia cordata generally has side effects such as gastrointestinal discomfort, allergic reactions, bad breath, impaired kidney function, and poisoning. A detailed analysis is as follows:

　　1. Gastrointestinal discomfort: Houttuynia cordata has a cold and cool nature, which can irritate the gastrointestinal tract after consumption, accelerate intestinal motility, and easily cause symptoms such as abdominal pain and diarrhea. These symptoms are especially pronounced in individuals with inherently weak gastrointestinal function after consuming large amounts or using it long-term.

　　2. Allergic reactions: Houttuynia cordata contains components such as volatile oils and flavonoids, which may act as allergens, triggering allergic symptoms such as skin itching, rashes, and red spots. In severe cases, symptoms such as laryngeal edema and breathing difficulties may occur, endangering life safety.

　　3. Bad breath: The unique odor of Houttuynia cordata originates from volatile components such as decanoyl acetaldehyde. After consumption, these components may remain in the mouth, where they are broken down by bacteria to produce unpleasant smells, causing halitosis and affecting social interactions.

　　4. Impaired kidney function: The aristolactam content in Houttuynia cordata can damage kidney cells during metabolism in the human body, impairing the kidneys' normal filtration and excretion functions. Long-term and excessive intake may lead to decreased kidney function and increase the risk of kidney disease.

　　5. Poisoning: Overconsumption of Houttuynia cordata may cause excessive intake of harmful components in a short time, leading to poisoning symptoms such as nausea, vomiting, palpitations, anxiety, convulsions, and unconsciousness, seriously threatening health and life safety.

　　When using Houttuynia cordata, it is essential to control the dosage and follow medical advice. If any of the above adverse symptoms occur, consumption should be stopped immediately, and timely medical consultation and treatment should be sought to prevent worsening of the side effects.

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