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Headwind (Toufeng) is the same as Shoufeng. The Classics state: The manifestation of Shoufeng involves excessive sweating on the head and face, aversion to wind, with headache intensifying one day prior to the wind blowing, and subsiding slightly on the day of the wind. If a pathogenic wind qi ascends along the Fengfu (GV16) acupoint, it causes brain pain, termed Naofeng (Brain Wind). The Classics further state: The etiology of Toufeng lies in Wind-Cold invading the brain marrow. Headache persisting for years without cure indicates severe Cold invasion. If the patient has pre-existing Phlegm-Fire within, and external Wind-Cold pathogens lodge therein, heat becomes stagnant causing visual dimness and chest oppression; this sensation, which feels like pain but is not distinct pain, is called Touyun (Dizziness/Vertigo). If accompanied by blurred vision, darkness, the illusion that stationary objects are moving, deafness upon body rotation, a sensation of standing on a rocking boat or carriage, desire to fall when rising, and even vomiting with poor appetite, this results from Liver Wood being shaken by Wind, stirring its Qi, causing Phlegm-Fire to rebel upward with the Qi. If caused by hematemesis, epistaxis, or uterine bleeding (Benglou), this is due to Spleen deficiency failing to control Blood and Qi, leading to disordered blood flow. Or, if caused by excess alcohol and sexual indulgence, resulting in Kidney deficiency failing to grasp Qi, causing Qi to rush upward; or acquired through extreme deficiency combined with Cold exposure, this is called Toutxuan (Dizziness). If sudden, unbearable head pain occurs, feeling like splitting or fine cutting, it is simply named Tengtong (Headache); if deep-seated and chronic, it is named Toufeng. Gouty pain inevitably affects the eyes because, as the Classics state, Spring Qi resides in the head, Wind Qi connects with the Liver, and the Liver opens into the eyes. Treatment must first differentiate among the Six Channels (Taiyang, Yangming, Shaoyang, Taiyin, Shaoyin, Jueyin), then distinguish between Jue Tengtong (Jue Headache), Pian Tengtong (Hemicrania), and Zhen Tengtong (True Headache), followed by differentiating Blood Deficiency, Qi Deficiency, Damp-Heat, and Cold-Damp patterns. For instance, Taiyang Headache presents with aversion to wind and cold, floating-tight pulse, and pain at the vertex and lateral frontal angles; Shaoyang Headache presents with alternating chills and fever, wiry pulse, and pain radiating to the ear root; Yangming Headache presents with fever and spontaneous sweating, floating-large pulse, and pain at the Juyang area, radiating to the eyes, teeth, and cheeks; Taiyin Headache necessarily involves Phlegm, heavy body or abdominal pain, sinking-slow pulse, and a heavy sensation in the head; Shaoyin Headache is due to rebellious Cold Qi, constituting Cold Jue, with a sinking-small pulse; Jueyin Headache presents with spitting of phlegm foam, cold extremities, floating-slow pulse, and pain radiating to the Eye System (Muxi). These six types of Channel-related headaches mostly involve external pathogens. Blood Deficiency Headache involves pain attacking upward from the outer canthus (Yuwu), with a floating-but-weak pulse; Qi Deficiency Headache presents with tinnitus, dysfunction of the nine orifices, and a sinking-soft pulse; Damp-Heat Headache presents with vexation and aversion to heat, heavy head worsening on cloudy days; Cold-Damp Headache presents with rebellious Qi failing to descend, occasional diarrhea, and slight relief upon contact with damp-heat items; Hemicrania involves a stalemate between Pathogenic and Righteous Qi, where Pathogenic Qi circulates while Righteous Qi is obstructed causing pain; left-sided pain primarily indicates Wind or Blood Deficiency, right-sided pain primarily indicates Qi Stagnation or Phlegm-Heat, though Cold-Deficiency may also be present; Jue Headache results from severe Cold invading to the bone marrow; since Marrow governs the Brain, rebellious Brain Qi causes headache, with a sinking-slow pulse; True Headache involves severe pain connecting to the Naohu (GV17) acupoint, cold extremities reaching the joints, extremely slow or absent pulse, with death occurring from morning to evening or evening to morning. These seven types of headaches mostly arise from internal factors. Furthermore, if pain in the supraorbital ridge is severe, attacking upward to the temporal angle and downward to the eyeballs, it may belong to Heart-Liver Heat accumulation, Wind-Phlegm rebellion, internal Damp stagnation, or external Wind-Cold. Pain in the eye sockets upon exposure to light indicates Liver Deficiency. Pain preventing eye opening, worse at night than during the day, indicates retained fluids in the Spleen-Stomach and disharmony between Wood and Earth. Headache that comes and goes, shifting suddenly from one spot to another, indicates Lower Deficiency and Upper Excess, with wandering Wind and Fire. Zhu Danxi stated: Headache is mostly due to Phlegm, severely due to Fire, treatable by emesis or purgation. This view does not encompass the whole picture and should not be lightly followed. Practitioners must first observe accompanying pathogens, investigate etiology, determine the involved channels, integrate pulse diagnosis, and then apply specific formulas to remedy the condition. Average physicians know only that Toufeng impairs vision but never investigate its origin. Crude physicians discuss symptoms solely regarding the eyes, failing to recognize Toufeng altogether, and some even cause Toufeng through reckless treatment, which is lamentable. Therefore, this collection emphasizes the character "Wind" repeatedly. Although Toufeng is listed separately, distinctions remain unclear; thus, detailed compilation follows, including records of vertigo and headache.