A comprehensive article listed on the National Centre for Complementary and Integrative Health website
“Many studies have investigated meditation for different conditions, and there’s evidence that it may reduce blood pressure as well as symptoms of irritable bowel syndrome and flare-ups in people who have had ulcerative colitis.
It may ease symptoms of anxiety and depression, and may help people with insomnia. Meditation also may lower the incidence, duration, and severity of acute respiratory illnesses (such as influenza).”
Read more about meditation and science here: https://nccih.nih.gov/health/meditation/overview.htm#hed2