Dashu (Major Heat), the 12th of the 24th solar terms, falls between Minor Heat and the Beginning of Autumn. It begins on July 23rd this year.
Climate Characteristics
The Major Heat is the final solar term of summer and the hottest period of the year. The average temperature exceeds 30 degrees Celsius. During this time, the ground continuously emits hot air, and the scorching weather can have adverse effects on the body.
Heat Exhaustion and Fluid Depletion
According to the Inner Canon of Huangdi, the classic book of traditional Chinese medicine(TCM), excessive heat easily damages the body’s yang energy. Moreover, the heat forces perspiration, leading to the depletion of bodily fluids during Major Heat. Heat exhaustion and fluid depletion can cause symptoms ranging from mild fatigue to severe heatstroke, where body temperature rises uncontrollably and poses a life-threatening risk, especially for those people who are vulnerable to heat-related issues, including children, the elderly, individuals with heart disease, high blood pressure, and obesity.
In TCM, it is suggested to avoide vigorous physical activities in hot weather, reduce sun exposure, stay hydrated by drinking an ample amount of water to prevent dehydration. Indoor environments should be kept cool and well-ventilated by opening windows, using fans, or utilizing air conditioning systems. Avoiding caffeinated beverages (such as tea or coffee) or alcoholic drinks can minimize the loss of body fluids through urine.
Heat and Dampness
Apart from the intense heat, Major Heat is characterized by increased rainfall, making the weather hot and humid. As a result, the human body is susceptible to being affected by dampness, exacerbating the impact of the heat. The combination of heat and dampness can affect the spleen and stomach, leading to poor appetite, indigestion, abdominal pain, and diarrhea, among other common symptoms.
During this time, Chinese medicine doctor advised it is important to pay attention to food hygiene, and avoiding excessive consumption of raw, cold, or frozen foods, and a diet that is light and easy to digest. Additionally, it is beneficial to consume seasonal foods such as winter melon and watermelon, which have cooling properties to relieve heat.”
