Cold-water exposure is hot right now. From influencers promoting the mental-health benefits of cold showers to professional athletes swearing by ice baths for recovery, the practice has become a major wellness trend. Advocates say it can sharpen focus, boost immunity, and even reduce inflammation.
While research remains limited, studies suggest brief exposure to cold water can improve alertness and mood. When cold water hits the skin, it triggers a “cold-shock response,” including rapid breathing, a temporary spike in heart rate and blood pressure, and a release of stress hormones that can make a person feel invigorated, according to Dr. Jonathan Leary, founder and CEO of wellness social club Remedy Place.
Small studies indicate this type of exposure may release mood-enhancing neurotransmitters like dopamine and norepinephrine. One analysis published in 2025 found that 12 hours of cold-water immersion reduced stress and improved sleep quality. A 2015 trial in the Netherlands showed that ending warm showers with 30 to 90 seconds of cold water cut the number of sick days taken by almost 30%, though it did not reduce the incidence of illness itself. Experts say these findings are interesting but not conclusive. “It’s reasonable to say cold exposure may help, not that it absolutely does,” said Dr. Neha Pathak, a physician in internal and lifestyle medicine.
Cold-water immersion also stimulates the sympathetic nervous system, releasing adrenaline and norepinephrine. This response temporarily increases heart rate, circulation, and alertness while mobilizing certain immune cells. A 2014 study showed participants trained in cold exposure and controlled breathing had a reduced inflammatory response to endotoxins compared with a control group. “The immunity response is felt to be a direct correlation to stress reduction,” said Dr. Sirisha Vadali, a cardiologist at HonorHealth Women’s Heart Health in Arizona.
Cold showers offer a milder, safer form of cold exposure than ice baths, which drop core body temperature more rapidly and carry higher risks of hypothermia or heart rhythm disturbances. “Ice baths cause a faster drop in body temperature and higher adrenaline release,” explained Dr. Parth Bhavsar, a thermoregulation researcher at Wellstar North Fulton Hospital in Georgia.
Cold-water therapy is not suitable for everyone. People with cardiovascular disease, high blood pressure, circulatory problems, or pregnancy should consult a doctor before trying it. For healthy adults, gradual exposure can train the body to transition between stress and rest states, potentially enhancing emotional resilience.
Experts recommend starting with shorter periods of cool water around 68–70°F, gradually reducing the temperature over time. One to three minutes at 50–60°F is generally sufficient, with longer or colder exposure posing potential risks. “There’s no perfect temperature or duration,” Pathak said. “The key is finding a safe, uncomfortable-but-tolerable zone for you.”