Can eating garlic cause “internal heat”?

Garlic is a common household ingredient frequently used in cooking. Many people also enjoy eating raw garlic. Does consuming garlic cause “internal heat” (a traditional Chinese medicine concept referring to excessive internal body heat)?

Can eating garlic cause “internal heat”?

Garlic is pungent and warm in nature; long-term or excessive consumption may lead to “internal heat.” Individuals with yin deficiency and hyperactive fire—a TCM pattern characterized by deficient yin of the liver and kidneys, lungs, or heart, resulting in ascending false fire—should avoid garlic. Symptoms indicating yin deficiency with hyperactive fire include tidal fever, night sweats, thirst, and a sensation of heat in the palms, soles, and chest. People exhibiting these symptoms should refrain from consuming garlic. Due to its strong pungency, raw garlic can cause a burning sensation in the mouth. Those with tongue or throat irritation, or oral ulcers, should also avoid raw garlic, as it may irritate mucosal tissues and exacerbate existing conditions.

Garlic can be categorized by outer skin color into white garlic, purple garlic, and black garlic, among which white and purple varieties are most common. Purple garlic tends to be spicier than white garlic and contains higher levels of allicin—the primary bioactive compound—conferring stronger antibacterial effects. “Scapes” (immature flower stalks) of garlic possess enhanced anticancer properties. A garlic scape develops when the plant suffers nutritional deficiency or suboptimal growth, resulting in an underdeveloped bulb with fewer leaves. Its distinctive pungent flavor carries medicinal value, and its anticancer activity surpasses that of ordinary sliced garlic.

Garlic exerts a certain degree of irritation on the gastrointestinal tract. Excessive raw consumption may trigger acute gastritis, while prolonged overconsumption may cause ocular discomfort. Therefore, individuals with sensitive or compromised gastrointestinal function should limit intake to no more than one clove per day; those with robust digestive systems should not exceed two to three cloves daily. Garlic should never be consumed on an empty stomach, as this increases the risk of acute gastritis. Additionally, long-term continuous garlic consumption is discouraged. People suffering from chronic halitosis (bad breath), bromhidrosis (body odor), or severe acne should also avoid garlic. We hope this information proves helpful!