"Are Your Joints a Weather Station?" Aching When the Cold Wind Blows, Is It All Due to the Weather?

The wisdom of the Donguibogam is steadily being explained by modern science. The phenomenon where joints ache especially on chilly or humid days is termed meteoropathy, which results from complex physiological responses. First, low barometric pressure and high humidity cause pressure changes inside the joint. The joint encloses synovial fluid within a pouch called the joint capsule. When external barometric pressure drops, internal pressure becomes relatively higher, causing the joint capsule to expand slightly. This expansion stimulates nerve endings around the joint, which is perceived as pain. Joints with nerve injury or inflammation respond even more sensitively to these barometric pressure changes, behaving much like a barometer. Next, cold temperatures constrict blood vessels and impair blood circulation around the joint. When blood circulation is poor, pain-inducing inflammatory mediators such as prostaglandins cannot be cleared properly and accumulate, which can worsen inflammation and pain. Furthermore, cold qi stiffens the muscles and ligaments surrounding the joint, reducing flexibility and leading to a vicious cycle that compounds pain and stiffness. An aching, cold sensation can be a direct sign of this reduced blood circulation and muscle rigidity. What about humidity? High humidity affects internal fluid metabolism, potentially increasing the viscosity of synovial fluid or causing edema in tissues around the joints. Patients with rheumatoid arthritis or osteoarthritis are especially vulnerable to these external stimuli because inflammatory responses are already active inside their joints. A humid environment further promotes inflammatory responses and lowers the pain threshold, causing even minor stimuli to produce substantial pain. The autonomic nervous system also reacts to weather changes, influencing stress hormone secretion or immune responses, which can amplify joint pain even further.