The side effects of Cordyceps are as follows: the first point is that infants taking Cordyceps can affect growth and development, and women taking Cordyceps during menstruation can aggravate bleeding and cause lack of qi and blood. The second point is that patients with real inflammation, real fire, and body in a high fever state, taking Cordyceps will further increase the body temperature, which is not good for inflammation control and fire reduction. The third point is that patients with high blood pressure, stroke and tumor must be careful when using Cordyceps, otherwise it will raise the blood pressure and induce cerebral hemorrhage, and even the spread of tumor. The fourth point is that patients with bleeding must be careful when taking Cordyceps, as it may make the bleeding larger. The fifth point, patients with rheumatoid arthritis, taking Cordyceps can increase inflammation and joint pain.