Doctors at AIIMS Delhi are warning of serious health risks associated with the ongoing cold wave in North India, with temperatures dropping to season lows. They highlight increased risks for individuals with heart, lung, kidney, and metabolic conditions due to constricted blood vessels, reduced water intake, and increased salt consumption. Experts urge for a 'cold action plan' similar to heat waves to protect vulnerable populations and advise patients to adhere to medication and monitor vital signs.