Chill out: cold neck trick may ease IV pain for obese patients

This study tests a simple, drug-free way to reduce pain when getting an IV in people with obesity (BMI over 30). Researchers will apply a cold marble stone to the side of the neck for 5 seconds before inserting the IV. They believe this may stimulate the vagus nerve and lower pain. 150 adults having elective surgery will take part, with half getting the cold treatment and half getting standard care. Pain levels and vital signs will be compared between the two groups.