Which diseases should avoid eating凤尾草 (Adiantum capillus-veneris)?

There is no specific clinical prohibition against eating Pteris multifida (Phoenix-tail Fern) for any particular disease. However, certain groups of people are generally advised not to consume it, including individuals with cold-deficiency constitution, chronic diarrhea, pregnant women, women during menstruation, and those prone to allergies. It's important to consult a doctor before taking this herb to ensure safety and appropriate use. The details are as follows:

1. Individuals with Cold-Deficiency Constitution: Pteris multifida is considered cold in nature. People with a cold-deficiency body type may experience aggravated internal cold after consuming it, potentially leading to symptoms such as pale complexion and bluish lips, which can be detrimental to health.

2. Individuals with Chronic Diarrhea: Although Pteris multifida has effects of clearing heat, promoting diuresis, detoxifying, and relieving dysentery, its cold nature may increase bowel movements. For those who already suffer from chronic diarrhea or frequent bowel movements, consuming it might worsen their condition and delay recovery.

3. Pregnant Women: Pregnant women are considered a highly sensitive group. The cold nature of Pteris multifida may induce uterine contractions, increasing the risk of miscarriage or threatened abortion. Therefore, pregnant women should avoid consuming this herb.

4. Women During Menstruation: Women lose significant blood during menstruation and tend to be physically weaker at this time. Consuming cold-natured Pteris multifida may increase menstrual flow and prolong the duration of menstruation, negatively affecting the body.

5. Allergic Individuals: Those with allergic tendencies may develop allergic reactions after drinking Pteris multifida tea, manifesting as skin redness, swelling, pain, itching, and other symptoms.

During consumption of Pteris multifida, a light diet is recommended. Avoid spicy and irritating foods such as scallions, chili peppers, and Sichuan pepper, as they may interfere with the herb’s effectiveness. Adequate rest should also be maintained, and excessive fatigue should be avoided.