Eating Poria cocos generally does not aggravate constipation, but may aggravate constipation if consumed in excessive amounts. Constipation refers to the prolongation of the defecation cycle, fecal matter dry, difficult to discharge the disease. Pathogenesis is mainly due to heat knot, stagnation of qi, cold condensation, qi, blood, yin and yang deficiency caused by intestinal conduction failure. Poria is the dried mycelium of Poria cocos, a fungus of the family Poriaceae. It is sweet, light and flat in nature, and is attributed to heart, spleen and kidney meridians. It has the effect of diuresis and seepage of dampness (promoting the operation of water to get rid of dampness), strengthening the spleen and tranquilizing the heart, and is used for edema and urinary deficiency, phlegm-drinking vertigo and palpitation (vertigo and palpitation due to phlegm-drinking and evil qi upstream), deficiency of the spleen with little food, loose stools (feces that are thin and unshapely) and diarrhea, restlessness of mind and spirit, palpitation and insomnia. The commonly used clinical dosage is 10-15g. Because it has the effect of strengthening the spleen, so for the constipation caused by spleen deficiency and qi stagnation, the normal dose has a certain therapeutic effect, but if the constipation caused by heat knot, yin deficiency, or when the amount is too large, because it has the effect of diuresis, seepage of dampness, which can lead to further loss of bodily fluids and aggravate constipation. Therefore, the consumption of Poria cocos for the treatment of constipation, should be in the doctor under the correct identification, according to the need to take, not to take on their own.