The ‘San Jiu’ period—typically spanning days 19 to 27 after the Winter Solstice—is the coldest time of the year in traditional Chinese medicine. During this phase, external cold is at its peak while the body’s yang energy retreats inward, making immunity relatively weaker. Special attention should be paid to keeping warm, especially in these three vulnerable areas:1. **Head**: In TCM, the head is considered the ‘meeting point of all yang channels.’ Exposure to cold can trigger headaches, common colds, or even blood pressure fluctuations. Wearing a hat outdoors helps shield against chilly winds.2. **Lower Back**: The lower back houses the kidneys, which govern essence, fluid metabolism, and overall vitality. Cold exposure here may weaken kidney yang, leading to symptoms like soreness in the lower back and knees, fatigue, chills, and even reproductive or urinary issues. High-waisted clothing or a thermal back warmer is recommended.3. **Feet**: As the saying goes, ‘Cold enters through the feet.’ The soles contain numerous acupoints connected to internal organs via meridians. When feet get cold, pathogenic cold can travel upward, potentially causing abdominal pain, diarrhea, or joint discomfort. Wear thick socks and insulated shoes, and consider soaking feet in warm water nightly to promote circulation and dispel cold.During San Jiu, health preservation focuses on ‘conserving energy’ and ‘preventing invasion by cold.’ Properly protecting these three key areas supports immune function and helps you stay healthy through the harshest winter days.
三九天是一年中最寒冷的时段，通常出现在冬至后的第19天到第27天之间。此时寒气最盛，人体阳气内敛，抵抗力相对较弱，尤其要注意保暖。以下三个部位最容易受寒，需格外防护：1. **头部**：中医认为“头为诸阳之会”，头部是阳气汇聚之处，若受寒易引发头痛、感冒甚至血压波动。外出时应戴帽子，避免冷风直吹。2. **腰部**：腰为肾之府，肾主藏精、主水液代谢。腰部受寒会导致肾阳受损，出现腰膝酸软、畏寒乏力，甚至影响生殖和泌尿系统功能。建议穿高腰裤或加穿背心护腰。3. **脚部**：俗语说“寒从脚起”，脚底有众多穴位与经络相连，一旦受寒，寒气可沿经络上行，引发腹痛、腹泻或关节疼痛。应穿厚袜子、保暖鞋，并可每晚用温水泡脚以驱寒活血。三九天养生重在“藏”与“防”，保护好这三个关键部位，有助于提升免疫力、预防疾病，安然度过寒冬。
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