Is a dry cough without phlegm due to lung heat or lung cold?

Dry cough without phlegm may generally be a sign of either lung heat or lung cold. If the dry cough without phlegm is caused by external wind-heat, it is usually due to lung heat; however, if it results from external wind-cold, it may indicate lung cold. The specific analysis is as follows:

Lung heat causing dry cough without phlegm often arises when external wind-heat invades the interior, or when wind-cold pathogens transform into heat and accumulate in the lungs. Besides dry cough without phlegm, patients with lung heat may also experience symptoms such as sore and swollen throat, dry mouth and thirst, and constipation. For treating dry cough due to lung heat, medications with lung-moistening effects—such as *Shashen Zhike Tang San* (Adenophorae Decoction for Cough) or *Maicundan San Shi Yi Wei Wan* (Ophiopogonis Thirteen-Ingredient Pill)—may be used under medical guidance. Spicy and irritating foods should be avoided, while yin-nourishing and heat-clearing foods such as pears and white fungus are recommended.

Dry cough without phlegm due to lung cold primarily results from cold pathogens invading the lungs, leading to airway constriction and impaired local circulation. In addition to dry cough without phlegm, patients with lung cold may also feel chilly, have cold hands and feet, and present with clear nasal discharge. Treatment for lung cold-related dry cough should involve warming herbs that dispel internal cold, such as dried ginger and aconite, under medical supervision. Cold foods and raw, chilled beverages should be avoided, while warm-natured foods like ginger and garlic are beneficial.

In daily life, one should pay attention to adjusting clothing according to weather changes, avoid excessive fatigue and emotional fluctuations, and prevent further invasion of external pathogens into the lungs, which could worsen symptoms.