Can patients with excessive phlegm take Cornus officinalis (Shanzhuyu)?

Generally, when excessive phlegm is caused by kidney deficiency, patients can take Cornus officinalis (Shanzhuyu) under the guidance of a physician. However, if the excess phlegm is due to damp-heat or cold phlegm, it is not recommended for consumption. If in doubt, it is advisable to seek medical advice in advance. Detailed analysis is as follows:

Cornus officinalis has the effects of nourishing the liver and kidneys, and consolidating essence and urine. In traditional Chinese medicine theory, the kidneys govern fluid metabolism, and kidney deficiency may lead to fluid retention and thus phlegm production. For excessive phlegm caused by kidney deficiency, appropriate consumption of Cornus officinalis may provide some auxiliary benefits, helping to alleviate phlegm production caused by kidney deficiency.

If excessive phlegm is caused by accumulation of damp-heat or cold phlegm obstructing the lungs, Cornus officinalis should not be used. Damp-heat type phlegm typically presents with yellow, thick phlegm, dry mouth, and a dry tongue, while cold phlegm type phlegm usually presents with white, thin phlegm, cold intolerance, and cold limbs. Cornus officinalis is slightly warm in nature and has a nourishing and greasy property, which may worsen symptoms of damp-heat or cold phlegm, making phlegm more difficult to expel.

Patients with excessive phlegm should also pay attention to dietary regulation, avoiding spicy, greasy, and sweet foods that may easily lead to phlegm production. Drinking plenty of water and maintaining a light, easily digestible diet are also recommended.