Although yam itself is very mild, because it contains estrogen, if eaten in excess, it may excessively stimulate hormones, resulting in endometrial hyperplasia, and there will be symptoms such as unsmooth physiological period, menstrual bleeding and menstrual pain. At the same time, people with colds, warmth, excess evil and gastrointestinal stagnation should not use it.

Extended data

Yam is rich in nutrition, and it is the first choice for health-preserving people, but even if you eat too much delicious food or eat it incorrectly, it will bring serious harm to your body, and it is the same for yam. Although it is healthy, it still causes side effects if you don't pay attention.

Saponin contained in yam skin or phytoalkaloids contained in mucus will cause allergic and itchy yam when touched by a few people, so direct contact should be avoided when handling yam.

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