Poria mushrooms (Poria cocos), also known as Fu Ling in traditional Chinese medicine (TCM), have a long history of use in East Asian herbal traditions. They are often included in herbal formulas aimed at promoting urination, reducing dampness, and supporting spleen function. Within this context, Poria is sometimes used for symptoms that may be associated with hypertension, such as edema or fluid retention, but it is not traditionally targeted directly at high blood pressure itself.

Scientific research on the direct antihypertensive effects of Poria mushrooms is extremely limited. A few preclinical studies suggest Poria extracts may have mild diuretic and anti-inflammatory properties, which could theoretically contribute to blood pressure reduction. However, there are no robust clinical trials in humans confirming its efficacy for treating or managing hypertension. Most of the evidence supporting its use comes from traditional practice rather than modern scientific validation.

In summary, the use of Poria mushrooms for hypertension is justified primarily by traditional use in herbal medicine systems rather than by strong scientific evidence. The overall quality and quantity of supporting evidence is weak, and its use for this specific condition should be considered with caution.