Suggestion: scalp numbness due to blood deficiency and scalp numbness due to phlegm-dampness blocking collaterals: the former is mostly due to excessive blood loss, or insufficient biochemistry due to spleen deficiency, or blood gas loss due to long-term illness, and "qi deficiency is inhuman." Blood deficiency leads to skin loss of nutrition, so scalp pins and needles appear. The latter is mostly due to fatigue, spleen loss, water-dampness stagnation, phlegm accumulation, phlegm-dampness blocking meridians, affecting the operation of qi and blood, so skin numbness occurs; The head is the meeting of all yang, which prevents phlegm and dampness, and the Qing yang does not rise, so the scalp is numb. In syndrome differentiation, numbness is often the main symptom of scalp numbness due to blood deficiency, and there are also symptoms of blood deficiency such as dull complexion, lips, nails, dizziness, palpitation and pale tongue. Phlegm-dampness blocking collaterals and scalp numbness are often dominated by wood, often accompanied by dizziness, limb weakness, nausea, greasy fur and other symptoms of damp and turbid internal resistance. The clinical manifestations of two syndromes, one deficiency and one excess, are completely different and easy to distinguish. Treating scalp numbness due to blood deficiency should nourish blood and dispel wind, and Siwu Decoction should be used together with Spatholobus suberectus, Lumbricus and Notopterygium. Phlegm-dampness blocking collaterals and scalp numbness should be treated with phlegm-resolving, dampness-removing and collateral-dredging methods, and Huatan Yin can be selected. If both syndromes are accompanied by blood stasis, they can be combined with blood stasis-removing and collateral-dredging herbs such as Taoren and Honghua.

Scalp numbness has not been specifically discussed in medical books of past dynasties. The two syndromes of scalp numbness due to blood deficiency and scalp numbness due to phlegm-dampness blocking collaterals described in this book are only common symptoms. In addition, every kind of scalp numbness caused by qi deficiency and wind evil can be differentiated according to the pathogenesis and symptom characteristics.