Exterior Wind-Cold invasion is characterized by the classic symptoms of a wind-cold invasion, such as headache, fever, and chills. These symptoms arise when the body is exposed to external pathogenic factors like wind and cold, leading to the typical responses seen in such conditions.

Blood or Yin Deficiency often stems from long-term illness or significant blood loss. Blood and Yin in TCM are vital substances that nourish and moisten the body. Their Deficiency leads to a weakened state, making the body more susceptible to external pathogenic factors. Additionally, a Deficiency in Blood or Yin means the body lacks the necessary resources to respond effectively to these external challenges.

The presence of fever and chills indicates the external Wind-Cold factor. However, the chills are not strong, reflecting the body's debilitated state due to Blood or Yin deficiency.

The absence of sweating is a key symptom here. While Wind-Cold disorders typically suppress sweating, the inability to sweat is further exacerbated by the Blood or Yin Deficiency. The body requires adequate Blood and Yin to produce sweat, and their deficiency hampers this natural response.